According to the PMBOK® Guide (Project Management Body of Knowledge), specifically within the Project Integration Management knowledge area, the Close Project or Phase process is the process of finalizing all activities for the project, phase, or contract. The standard tools and techniques for this process are:

Expert Judgment (Option C): This is required to ensure the closure meets organizational and legal standards. Experts provide insight on administrative closure, final lessons learned, and the transfer of the product to operations.

Analytical Techniques (Option C): In the context of closure, analytical techniques are used to perform regression analysis, trend analysis, and variance analysis to verify that the project met its objectives and to document the final project performance.

Meetings (Option B and D): While meetings are used in nearly every process (including closure for lessons learned or wrap-up sessions), they are often paired with other specific tools.

Reserve Analysis (Option A): This is a tool used in Cost Management and Risk Management to determine if the remaining contingency and management reserves are sufficient. It is not a primary tool for the formal administrative closure of a project.

Performance Reviews (Option D): These are typically part of Control Schedule, Control Costs, or Manage Team to compare actual performance against the baseline. While relevant to the final report, the PMBOK® specifically highlights " Analytical Techniques " as the broader category for closure.

In the PMI framework, the combination of Expert Judgment, Analytical Techniques, and Meetings represents the standard toolkit for ensuring a project is legally, financially, and administratively finalized.