According to the PMBOK® Guide, specifically the Close Project or Phase process, the project team must finalize all activities across all Project Management Process Groups to formally complete the project or a phase.

Project Audit (A): This is a key administrative closure procedure. The purpose of a project audit at the closing stage is to identify the successes and failures of the project. It provides a structured review of what worked and what didn ' t, which is then captured in the Lessons Learned Register. It ensures that the project met its objectives and followed the organizational processes.

Issue Log Update (E): During the closing meeting, the team must ensure that all documented issues have been resolved or closed. If any issues remain open, they must be transitioned to another entity (such as operations or a follow-up project) or formally dismissed. The final status of all issues must be updated to reflect that the project is no longer active.

Knowledge Transfer: Both of these activities contribute to the final Project Report, which summarizes the project performance and transitions the final product, service, or result to the customer or operations.

Analysis of other options:

Deliverable acceptance (Option B): This is part of the Validate Scope process. While it is a prerequisite for closing, the formal acceptance of deliverables should occur before the final closing stage meetings. Closing assumes the customer has already accepted the final product.

Risk register tracking (Option C): This is an activity performed during the Monitor Risks process throughout the execution of the project. Once the project is in the final closing meeting, active risk tracking is replaced by documenting the final risk status and lessons learned.

Stakeholder mapping (Option D): This is an activity performed during Initiation (Identify Stakeholders) and Planning. It is not a closing function.

Per PMI standards, the closing stage is focused on administrative finalization and the archival of project information. Performing a Project Audit and performing a final Issue Log Update are essential steps to ensure the project is closed cleanly and that the organization benefits from the experience.