The best way to ensure that information security concerns are considered during the procurement of SaaS solutions is to integrate information security risk assessments into the procurement process. This will allow the organization to identify and evaluate the potential security risks and impacts of using a SaaS provider, and to select the most appropriate solution based on the risk appetite and tolerance of the organization. Information security risk assessments should be conducted at the early stages of the procurement process, before selecting a vendor or signing a contract, and should be updated periodically throughout the contract lifecycle.
Providing regular information security training to the procurement team (B) is a good practice, but it may not be sufficient to address the specific security issues and challenges of SaaS solutions. The procurement team may not have the expertise or the authority to conduct information security risk assessments or to negotiate security requirements with the vendors.
Inviting IT members into regular procurement team meetings to influence best practice © is also a good practice, but it may not be effective if the IT members are not involved in the actual procurement process or decision making. The IT members may not have the opportunity or the influence to conduct information security risk assessments or to ensure that security concerns are adequately addressed in the procurement contracts.
Enforcing the right to audit in procurement contracts with SaaS vendors (D) is an important control, but it is not the most effective way to ensure that information security concerns are considered during the procurement process. The right to audit is a post-contractual measure that allows the organization to verify the security controls and compliance of the SaaS provider, but it does not prevent or mitigate the security risks that may arise from using a SaaS solution. The right to audit should be complemented by information security risk assessments and other security requirements in the procurement contracts.
References = CISM Review Manual (Digital Version), Chapter 3: Information Security Program Development and Management, Section: Information Security Program Management, Subsection: Procurement and Vendor Management, Page 141-1421