New PMP Question & Answers with explanation

Some previously unidentified stakeholders report that they have not been kept informed regarding the status of a critical project even though their functional areas are largely impacted. What should the project manager do first?
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Due to resource challenges, a technology vendor is late with a critical project deliverable. There is a 20 percent buffer in the budget for cost overruns. What should the project manager do next to mitigate this issue?
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Midway through a project, the project manager identifies new stakeholders whose influence levels are low. What should the project manager do?
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The project manager of a life cycle replacement project has identified stakeholders. One stakeholder is someone with whom it is difficult to work, and their behavior is causing project delays. What should the project manager do?
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