According to the PMBOKĀ® Guide, the Project Management Plan is the primary document that defines how the project is executed, monitored, controlled, and closed. It is composed of several subsidiary plans and baselines.
Subsidiary Management Plans: These include plans for Scope, Schedule, Cost, Quality, Resources, Communications, Risk, Procurement, and Stakeholder Engagement. Option A correctly identifies the Scope Management Plan and the Risk Management Plan.
Baselines: There are three primary baselines: Scope Baseline, Schedule Baseline, and Cost Baseline. Option A correctly includes the Scope Baseline.
Additional Components: The plan also includes the Configuration Management Plan, which describes how information about the items of the project (and which items) will be recorded and updated so that the product, service, or result of the project remains consistent.
Why other options are incorrect:
Option B: The Issue Log and Risk Register are Project Documents, not components of the Project Management Plan itself. The Project Schedule Network Diagram is also a project document.
Option C: While the Schedule Baseline is part of the plan, the Milestone List and Assumption Log are classified as Project Documents.
Option D: Cost Estimates, Duration Estimates, and Resource Calendars are all considered Project Documents. They support the plan but are not part of the formal Project Management Plan " package " as defined by PMI standards.