Explanation
The project manager should review the communication plan after learning about some communication issues with different stakeholders and team members. A communication plan is a document that defines and documents the communication goals, strategies, methods, channels, frequency, roles, and responsibilities for a project. A communication plan can help to facilitate effective and timely communication among all stakeholders involved in a project and avoid confusion, misunderstanding, or conflicts.

A risk log or risk register is used to document potential risks to the project, including the loss of team members due to high stress. CompTIA Project+ recommends this log as a tool for identifying and managing risks throughout the project lifecycle.

Control objectives are the desired outcomes or goals of implementing security controls to mitigate risks and protect information assets. Control objectives should be the primary basis for establishing metrics that measure the effectiveness of an information security program, as they align with the business objectives, requirements, and expectations of the organization and its stakeholders. Metrics based on control objectives can help to evaluate the performance, efficiency, and maturity of the security program, and to identify gaps, issues, and areas for improvement. The other options are not correct because:
Residual risk is the remaining risk after applying security controls. Residual risk is not a basis for establishing metrics, but rather a result of measuring the effectiveness of security controls. Residual risk should be monitored and reported, but it does not define the desired outcomes or goals of the security program.
Regulatory requirements are the external standards, laws, and regulations that the organization must comply with to avoid legal or financial penalties. Regulatory requirements are not a basis for establishing metrics, but rather a constraint or a driver for the security program. Metrics based on regulatory requirements can help to demonstrate compliance, but they may not reflect the actual effectiveness or efficiency of the security program.
Risk tolerance is the level of risk that the organization is willing to accept or bear. Risk tolerance is not a basis for establishing metrics, but rather a factor or an input for the security program. Metrics based on risk tolerance can help to prioritize and allocate resources, but they may not measure the actual outcomes or goals of the security program. References = Key Performance Indicators for Security Governance, Part 1; 14 Cybersecurity Metrics + KPIs You Must Track in 2023; KPIs in Information Security: The 10 Most Important SecurityMetrics; Why metrics are crucial to proving cybersecurity programs' value; Implementing and Maintaining Security Program Metrics

A real-time survey is a tool that allows the project manager to collect feedback from the project team members in an interactive and timely manner. A real-time survey can measure the level of engagement, satisfaction, motivation, and performance of the team members, as well as identify any issues, challenges, or opportunities for improvement. A real-time survey can also increase the participation and collaboration of the team members, as they can see the results and comments of their peers instantly. A real-time survey is more effective than a meeting chat, an email, or a whiteboard, as it can reach a larger and more diverse audience, provide more structured and quantitative data, and avoid distractions and interruptions. References = CompTIA Project+ Study Guide: Exam PK0-005, 3rd Edition, Chapter 10: Project Closure, p. 367; The 9 best online survey apps in 2023 | Zapier

Project quality assurance is the process of ensuring that the project meets the quality standards and requirements defined by the stakeholders and the organization. It involves planning, implementing, and monitoring quality activities throughout the project life cycle. Project quality assurance is different from project quality control, which is the process of inspecting and testing the project deliverables and outputs to identify and correct defects. Project quality assurance is also different from project transition, which is the process of transferring the project deliverables and outputs to the end users or customers. Project management is the application of knowledge, skills, tools, and techniques to project activities to meet the project objectives. Project communications is the process of planning, creating, distributing, and managing information among the project stakeholders. Reference = CompTIA Project+ Study Guide: Exam PK0-005, 3rd Edition, Chapter 8: Quality Management1; CompTIA Project+ Certification Study Guide, 3rd Edition, Chapter 8: Quality Management2