New PMP Question & Answers with explanation

After project closure but during the warranty period, the project manager wants to determine whether the customer is satisfied with the project's outcome. How can the project manager measure this?
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A project manager is ready to close a project. What should the project manager do next?
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A project is completed, and closeout activities are underway. The project manager discovers that a team member is performing operations activities unrelated to the project scope, but necessary for regular operations. Since the final deliverables must be handed over to operations, what should the project manager do?
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A project manager completes a major IT deployment project. The project manager confirms with the release manager that all systems are working and that functionality has been verified by the quality assurance team. After informing the customer, what should the project manager do next?
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A project has ended; however the project manager and project team members are still called to solve technical issues, make some small changes, and evaluate new requirements. What should the project manager do to guarantee the product or service developed by the project now has operational support?
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