New PMP Question & Answers with explanation

A project team has fallen behind schedule on some tasks. The project manager tries to fix the issue by reprioritizing a few subsequent tasks. This does not resolve the scheduling problem, and the project manager must now escalate the issue to the project's stakeholders. To what plan should the project manager refer to escalate this?
Select one
Without a project manager's knowledge, an unofficial communications platform on social media was established to ensure effective communication among team members. The project manager learns that the platform is being used inappropriately. What should the project manager do?
Select one
During the execution phase of a software development project, several overseas developers join the team. What should the project manager update first?
Select one
A stakeholder believes that information is lacking and asks the project manager about the project's status. What should the project manager do?
Select one
During project execution, the project manager determines that communications fail to comply with the communications management plan. What should the project manager do?
Select one