New PMP Question & Answers with explanation

Which of the following is NOT a valid WBS creation approach:
Select one
Robert is managing a road construction project. Due to unseasonal weather conditions, the team productivity might be above or below target. This is an example of:
Select one
Which of the following is not a Risk Diagramming technique?
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Work Performance Information is not an output of which of the following processes?
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You have assembled a group of subject matter experts (SMEs) to define risk probability and impact levels. You and your team are still in what process group?
Select one