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Cost-benefit analysis (CBA) is a method of comparing the costs and benefits of different alternatives for achieving a desired outcome. CBA can help information security managers to choose the best controls to mitigate risk to acceptable levels by providing a rational and objective basis for decision making. CBA can also help information security managers to justify their choices to senior management, stakeholders, and auditors by demonstrating the value and return on investment of the selected controls. CBA can also help information security managers to prioritize and allocate resources for implementing and maintaining the controls12.

CBA involves the following steps12:

Identify the objectives and scope of the analysis

Identify the alternatives and options for achieving the objectives

Identify and quantify the costs and benefits of each alternative

Compare the costs and benefits of each alternative using a common metric or criteria

Select the alternative that maximizes the net benefit or minimizes the net cost

Perform a sensitivity analysis to test the robustness and validity of the results

Document and communicate the results and recommendations

CBA is mainly driven by the information security manager’s decision, but it can also take into account other factors such as best practices, control frameworks, and regulatory requirements. However, these factors are not the primary drivers of CBA, as they may not always reflect the specific needs and context of the organization. Best practices are general guidelines or recommendations that may not suit every situation or environment. Control frameworks are standardized models or methodologies that may not cover all aspects or dimensions of information security. Regulatory requirements are mandatory rules or obligations that may not address all risks or threats faced by the organization. Therefore, CBA is the best method to choose the most appropriate and effective controls to mitigate risk to acceptable levels, as it considers the costs and benefits of each control in relation to the organization’s objectives, resources, and environment12. References = CISM Domain 2: Information Risk Management (IRM) [2022 update], Five Key Considerations When Developing Information Security Risk Treatment Plans

= Information classification is the process of assigning appropriate labels to information assets based on their sensitivity and value to the organization. Information classification should be aligned with the business objectives and risk appetite of the organization, and should be reviewed periodically to ensure its accuracy and relevance. The information security manager is responsible for establishing and maintaining the information classification policy and procedures, as well as providing guidance and oversight to the data owners and custodians. Data owners are the individuals who have the authority and accountability for the information assets within their business unit or function. Data owners are responsible for determining the appropriate classification level and security controls for their information assets, as well as ensuring compliance with the information classification policy and procedures. Data custodians are the individuals who have the operational responsibility for implementing and maintaining the security controls for the information assets assigned to them by the data owners.

If the information security manager believes that information has been classified inappropriately, increasing the risk of a breach, the best action is to complete a risk assessment and refer the results to the data owners. A risk assessment is a systematic process of identifying, analyzing, and evaluating the risks associated with the information assets, and recommending appropriate risk treatment options. By conducting a risk assessment, the information security manager can provide objective and evidence-based information to the data owners, highlighting the potential impact and likelihood of a breach, as well as the cost and benefit of implementing additional security controls. This will enable the data owners to make informed decisions about the appropriate classification level and security controls for their information assets, and to justify and document any deviations from the information classification policy and procedures.

The other options are not the best actions for the information security manager. Refering the issue to internal audit for a recommendation is not the best action, because internal audit is an independent and objective assurance function that provides assurance on the effectiveness of governance, risk management, and control processes. Internal audit is not responsible for providing recommendations on information classification, which is a management responsibility. Re-classifying the data and increasing the security level to meet business risk is not the best action, because the information security manager does not have the authority or accountability for the information assets, and may not have the full understanding of the business context and objectives of the data owners. Instructing the relevant system owners to reclassify the data is not the best action, because system owners are not the same as data owners, and may not have the authority or accountability for the information assets either. System owners are the individuals who have the authority and accountability for the information systems that process, store, or transmit the information assets. System owners are responsible for ensuring that the information systems comply with the security requirements and controls defined by the data owners and the information security manager. References = CISM Review Manual, 16th Edition, ISACA, 2020, pp. 49-51, 63-64, 69-701; CISM Online Review Course, Domain 3: Information Security Program Development and Management, Module 2: Information Security Program Framework, ISACA2

Infrastructure as a Service (IaaS) is a cloud model in which the cloud service provider (CSP) offers the basic computing resources, such as servers, storage, network, and virtualization, as a service over the internet. The cloud service buyer (CSB) is responsible for installing, configuring, managing, and securing the operating systems, applications, data, and middleware on top of the infrastructure. Therefore, the CSB assumes the most security responsibility in the IaaS model, as it has to protect the confidentiality, integrity, and availability of its own assets and information in the cloud environment.

In contrast, in the other cloud models, the CSP takes over more security responsibility from the CSB, as it provides more layers of the service stack. In Disaster Recovery as a Service (DRaaS), the CSP offers the replication and recovery of the CSB’s data and applications in the event of a disaster. In Platform as a Service (PaaS), the CSP offers the development and deployment tools, such as programming languages, frameworks, libraries, and databases, as a service. In Software as a Service (SaaS), the CSP offers the complete software applications, such as email, CRM, or ERP, as a service. In these models, the CSB has less control and visibility over the underlying infrastructure, platform, or software, and has to rely on the CSP’s security measures and contractual agreements.

References = CISM Review Manual, 16th Edition, Chapter 3: Information Security Program Development and Management, Section: Information Security Program Management, Subsection: Cloud Computing, page 140-1411

The answer to the question is C. Risk response scenarios. This is because risk response scenarios are the predefined plans and actions that the organization will take to respond to specific types of incidents, such as cyberattacks, natural disasters, or data breaches. Risk response scenarios should be aligned with the corporate strategy, which defines the vision, mission, goals, and objectives of the organization, and guides the decision-making and resource allocation processes. By aligning the risk response scenarios with the corporate strategy, the organization can ensure that the incident response plan supports the achievement of the desired outcomes and benefits, and minimizes the impact and disruption to the business operations and performance.

Risk response scenarios are the predefined plans and actions that the organization will take to respond to specific types of incidents. Risk response scenarios should be aligned with the corporate strategy, which defines the vision, mission, goals, and objectives of the organization. (From CISM Manual or related resources)

References = CISM Review Manual 15th Edition, Chapter 4, Section 4.2.2, page 2111; CISM domain 4: Information security incident management [2022 update] | Infosec2; A Guide to Effective Incident Management Communications3