New PMP Question & Answers with explanation

Within Agile approaches, how are requirements documented?
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Alyssa is a project manager tasked with managing an infrastructure project that will consolidate five data centers into one. She has used a waterfall approach to carry out initial planning activities and is executing the work using an Agile-based approach. She shows the team how much work remains to be completed during their current iteration and the forecast of work to be completed for the remaining iterations based on existing velocity. What is Alyssa showing them?
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What is the difference between inspection and prevention, in regard to quality?
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A product owner is performing risk management activities for an upcoming release. She sits down with the team to perform a risk assessment exercise and uses a probability and impact matrix. Which of the following statements are true regarding the probability and impact matrix?
Select three
Servant leaders are practicing role models of Agile practices. How do servant leaders approach their work?
Select three