New PMP Question & Answers with explanation

A hierarchical structure of project resources organized by category and resource type, used in planning, managing and controlling project work, is:
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During a presentation to management, you want to display the project schedule with only the key deliverables displayed. What is the correct tool for this purpose?
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Which of these is not an established Estimate Activity Durations technique?
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If you want to compress a project schedule, what are two of the recommended alternatives to consider?
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When is Rolling Wave Planning useful in a project?
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