New PMP Question & Answers with explanation

All of the following statements are true of the project Closing process group except for which one?
Select one
The Plan Procurement process applies evaluation criteria to bids and proposals and selects a vendor. It also uses independent estimates to compare vendor prices. This is also known as which of the following?
Select one
Who is responsible for performing and managing project integration when using an agile project management approach?
Select one
According to the PMBOK® Guide, which of the following names all the components of an interactive communication model?
Select one
You are a project manager working on gathering requirements and establishing estimates for the project. Which process group are you in?
Select one