New PMP Question & Answers with explanation

A project manager from a buyer organization is invited to lunch by the manager of a seller organization. The project manager's organization does not permit receipt of gifts from vendors. The project manager should:
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Your manager is presenting a status report of all projects being run in his division. He reports that all projects are showing a positive CV. However, you know that your status reports for the last several weeks have been reporting a negative CV. What do you do?
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One of the senior team members, who is the best performer in your project, plays favorites. A few of the other team members who work closely with this team member have gotten exceptionally good appraisal reports in the past, even though they may not have deserved them. As the project manager, what do you need to actively do?
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David was required to investigate a business problem and describe the higher-level needs of the business as a whole. David’s final reports describes in detail the features, functions and characteristics of the product that will meet the business and stakeholder requirements. What is wrong with David’s report?
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Project performance measurements assess the magnitude of variation from the original cost baseline. Once the degree of cost variation is known, what step is performed next?
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