New PMP Question & Answers with explanation

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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A project manager is concerned that team members spend too much time assisting operations and maintenance staff with a recently commissioned project component. To what documents should the project manager refer to validate that the component was signed off and ownership transferred?
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A senior project manager is guiding a new project manager in finalizing project activities. What should the senior project manager list as the key benefits of documenting final project activities?
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A project has been successfully delivered and the project manager is executing formal closure. What should the project manager do first?
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