New PMP Question & Answers with explanation

A functional manager in your organization has recently filed a complaint against a junior project manager regarding his project management certification. The functional manager claims that the PMP certification claimed by the junior project manager is invalid and needs to be checked. What should be your response as a senior project manager?
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In a software development project, you are having joint application development (JAD) sessions to collect product requirements from stakeholders. Which of the following mandatory standards in the PMI Code of Ethics and Professional Conduct is met by having JAD sessions while gathering requirements?
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You have recently taken over a project from a PMP-certified project manager who was removed from the project due to incompetence and lack of skills. When you happen to meet him outside your building, he starts rebuking you for taking his project. He even goes so far as to suggest that your religion played a part in your selection by the management. What should you do first?
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What should you do as a senior project manager if the PMP certification claimed by a recently recruited project manager does not appear in the PMI website?
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While conducting interviews for a project manager position, you notice that your classmate is one of the prospective candidates. What should you do immediately?
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