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Multitier architecture is a type of software architecture that is suitable to support enterprise-level client-server solutions. Multitier architecture divides an application into logical layers or tiers that are distributed among different servers or machines. Each tier performs a specific function or role and communicates with other tiers through well-defined interfaces. Multitier architecture can provide benefits such as scalability, performance, security, maintainability, and reusability for complex and large-scale applications.

Evaluating the impact to baselines (such as schedule and budget) helps determine the delay’s effect on the project. This aligns with CompTIA Project+ guidance on project control, which emphasizes analyzing impacts before taking corrective actions.

Application deployment typically involves making a software application available for use, often involving downtime or unavailability of the application. The description of the project manager notifying users about the application being unavailable for a certain period aligns with standard practices during deployment phases. The other options, such as rollback plans, validation checks, and maintenance window schedules, although important, do not directly indicate the action of making an application available for use, as described in the scenario.

The next step in the process after defining tasks, durations, resources, and costs is to seek baseline approval. A baseline is an approved version of a project plan that serves as a reference point for measuring progress and performance throughout the project lifecycle. A baseline typically includes scope, schedule, cost, quality, and risk parameters. Seeking baseline approval involves presenting the project plan to key stakeholders and obtaining their formal agreement on the project objectives and deliverables. Baseline approval can help to establish clear expectations, avoid scope creep, and facilitate change control during project execution.

The NEXT step after defining tasks, durations, resources, and costs during the planning phase is to seek baseline approval. Baseline approval involves finalizing the project plan and gaining approval from stakeholders, establishing the plan as the baseline for the project's performance. References: CompTIA Project+ Study Guide Section 3.4.1