New PMP Question & Answers with explanation

The client agreed to the final product during user testing, but is now having second thoughts. What should the project manager consult to resolve this issue?
Select one
A project manager reviewing the issue log notices that activities assigned to certain team members are significantly behind schedule. What should the project manager do?
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The day before manufacturing is to start, a project manager learns that the engineering design was not accepted by the end user. What should the project manager do?
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A team member is eager to add new features being considered by the customer to the project deliverable. Before beginning work on these new features, whose approval is required?
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A strategic project is about to begin user acceptance testing. Weekly progress meetings have been set up to prepare for testing with the business end users who have repeatedly raised questions and concerns. It is evident that there are critical business requirements that failed to be included in the business requirements analysis. What should the project manager do?
Select one