The project manager is responsible for ensuring that the project team has the necessary skills and competencies to perform the project work. If there are knowledge gaps in the team, the project manager should communicate the situation to the team and plan for the appropriate training and coaching arrangements to address them. This will help the team to improve their performance and achieve the desired results. The other options are not appropriate because they do not address the root cause of the problem and may have negative consequences for the project. Reporting the situation to upper management and requesting a scope change may not be feasible or acceptable. Hiring new team members and laying off existing ones may disrupt the team dynamics and morale. Communicating the situation to the customer and informing them about potential delays may damage the trust and relationship with the customer. References:
* PMBOK Guide 6th Edition, page 335, section 9.2.2.3
* PMP Exam Prep, page 265, section 9.2
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