New PMP Question & Answers with explanation

During the Collect Requirements process, a group of people were discussing multiple alternatives. One of the individuals in the group made the decision for the group. This method of reaching a group decision is termed:
Select one
Miranda is an experienced project manager. As part of the Collect Requirements phase, she decides to use a group creativity technique. This technique is intended to enhance brainstorming with a voting process and can be used to rank the most useful ideas for further brainstorming or prioritization. Which of the following will she likely use?
Select one
Joe has been managing a project for Exton Oil Corp. This project involves redesigning filling stations across the state. The redesign involves new gas pumps, security cameras, convenience stores, and use of environmentally friendly materials in the construction. While the redesigning work proceeds, Joe’s design engineer suggests a secondary alarm system for gas pumps to alert the attendant in case of a spill. Although this suggestion is not in the project requirements, Joe is impressed with the engineer’s recommendation. What should be the next step for Joe with regard to the engineer’s suggestion?
Select one
The WBS structure can be created in a number of forms except which of the following?
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During the execution of a project, a large number of defects were discovered. The project manager ensured that the issues, defect resolution, and action item results were logged into a defects database. What would the defect database be considered a part of?
Select one