According to the PMBOK Guide, 6th edition, section 13.2.2.4, stakeholder engagement assessment matrix is a tool that can be used to identify the current and desired levels of engagement for each stakeholder or stakeholder group. The project manager should use this matrix to plan and implement appropriate strategies to increase the support and minimize the resistance of the stakeholders. One of the strategies is to meet with the stakeholder and discuss the impact of the project deliverable on their interests, needs, and expectations. The project manager should also explain the benefits of the deliverable for the organization and the stakeholder, and address any concerns or issues that the stakeholder may have. By doing so, the project manager can increase the stakeholder's awareness, understanding, and involvement in the project, and foster a positive relationship with them. References: PMBOK Guide, 6th edition, section 13.2.2.4; PMI website

The first step in addressing an underperforming team member is to understand the root cause of the underperformance. This can be achieved by having a private discussion with the team member to understand their perspective and challenges. This approach promotes open communication and trust, and it allows the project manager to work collaboratively with the team member to find a solution. The other options may not address the root cause of the problem and could potentially lead to further issues down the line. References:
PMBOK Guide, 6th Edition, Section 9.5.2.1: Team Performance Assessments

* According to the PMBOK Guide, 6th edition, section 5.6.2, the project manager should perform an impact analysis when a change request is received, to assess the potential effects on the project scope, schedule, cost, quality, resources, risk, and other aspects.3
* The project manager should also communicate the impact analysis to the relevant stakeholders, such as the project sponsor, the product owner, the customer, and the team, to facilitate the decision making process and obtain their agreement on the change.3
* The project manager should not accept or reject the change request without performing an impact analysis, as this may lead to unrealistic expectations, missed deadlines, scope creep, or stakeholder dissatisfaction.3
* The project manager should not ask the product owner to prioritize the new request without performing an impact analysis, as this may disrupt the agile team's work and compromise the quality of the deliverables.4
* The project manager should not call the stakeholder to tell them that the final product schedule must be extended without performing an impact analysis, as this may damage the trust and relationship with the stakeholder and cause them to lose confidence in the project.
The references for this answer are:
1: Discuss Exam PMP Topic 2 Question 499 Discussion | Actual4test 2: Free PMP Practice Exam Questions -
120 Sample Test Questions 3: PMBOK Guide, 6th edition, Project Management Institute, 2017, pp. 149-
152. 4: Agile Practice Guide, Project Management Institute, 2017, pp. 37-38. : [Managing Stakeholder Expectations for Project Success: A Knowledge Integration Framework and Value Focused Approach, Ori Schibi, 2013, pp. 97-98.](https://www.pmi.org/learning