The execution phase is when the project manager and the team execute the project plan, deliver the project
outputs, and monitor and control the project performance. This includes tracking and managing the project
budget, scope, schedule, quality, and risks. Making adjustments to the budget based on the actual project
expenditures is part of the monitoring and controlling process in the execution phase. References = CompTIA
Project+ Study Guide: Exam PK0-005, 3rd Edition, Chapter 10: Executing and Closing Projects, p. 263.

Lessons learned, removing resources, and removing access are activities that a project manager would perform during the closing phase of a project. Lessons learned is a process of collecting and documenting the knowledge and experience gained from a project for future reference and improvement. Removing resources is a process of releasing or reallocating any human or material resources that were used for the project. Removing access is a process of revoking any permissions or privileges that were granted to the project team members or stakeholders for accessing any systems or data related to the project. These activities can help to finalize and close a project successfully and ensure that all deliverables are transferred, all documentation is approved and archived, all contracts are closed, and all stakeholders are satisfied.

Explanation
The project manager should review existing artifacts to get an understanding of the purpose of the project.
Existing artifacts are documents or records that provide information about the project background, context, scope, objectives, requirements, stakeholders, and deliverables. They may include documents such as project proposal, project charter, business case, feasibility study, statement of work (SOW), or contract. Reviewing existing artifacts can help to clarify the project vision and expectations and provide a basis for planning and executing the project.

The project manager should use a Pareto chart to prioritize which defects to address for the product. A Pareto chart is a type of bar chart that shows the frequency or impact of different causes of problems or defects. It also shows a cumulative line that represents the percentage of the total frequency or impact. A Pareto chart can help to prioritize the causes that have the most significant effect on the quality of the product and apply the 80/20 rule, which states that 80% of the problems are caused by 20% of the causes.

The percentage of risk investments with defined business cases is a metric that measures how well the information security program aligns with the operational objectives of the organization. It indicates how many of the security-related investments are justified by a clear analysis of the expected benefits, costs, and risks, and how they support the business goals and priorities. This metric can help the organization optimize its security spending, demonstrate the value of security to the stakeholders, and align the security strategy with the business strategy1. References = Performance Measurement Guide for Information Security, Section 3.2.3, page 16; Key Performance Indicators for Security Governance, Part 1, Section 3, page 3.