New PMP Question & Answers with explanation

Due to scope changes during project execution, the project manager identifies that a provider must make changes to a product module already in use. What should the project manager do first?
Select one
A customer rejects a deliverable because it fails to meet the agreed-upon quality specifications. The project team investigates the issue and determines that vendor-provided parts are at fault. The vendor refuses to correct the situation. What should the project manager review?
Select one
A project manager has obtained final acceptance of the deliverables, completed the assessment, released project resources, and closed out all procurement-related activities. What should the project manager do next?
Select one
A project is ready to close, but a vendor claims they have not received payment. The project manager sees that payment was approved, but is unable to find supporting documents from the finance department. The project manager wants to close the project due to a new assignment. What should the project manager do?
Select one