New PMP Question & Answers with explanation

Legitimate, expert, referent, and punishment are all types of what?
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The project manager facilitates the implementation of approved changes by following the documented change control process. Which of the following is a valid tool or technique to assist the project manager in performing this activity?
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A product manager meets with the team to apprise them of changes to how the upcoming project will be managed. She notes that the focus will now shift to producing deliverables through iterations and that iterative scheduling with a backlog will be used to account for the uncertainty in requirements. What is the value of this approach?
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Albert recently joined a rapidly growing technology startup company as a project manager. The approach to managing projects is different from the compliance-driven projects he is accustomed to managing in the past. He inherits a project that contains a great deal of uncertainty, with minimal requirements identified to date. To remedy this, he gathers the team and informs them that they will focus on nailing down the requirements before execution of work can continue. He is met with a high degree of resistance. What is the likely reason for this pushback from the team?
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Leticia is a project manager working for Dancing Apron, a company that combines cooking with simple children’s cooking recipes and music. Her latest project involves the release of the company’s first digital product that parents will be able to purchase and download online. While overseeing the project, Leticia notices that recent stakeholder engagement levels have dropped significantly, and they’ve begun to disagree during status meetings. What key input can she use to help her deal with the situation?
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