The following PMP® exam sample question is taken from the Free PMP Exam Simulator at http://free.pm-exam-simulator.com - The answer is at the very bottom:

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Regarding WBS Quality Principle 1, there are two sub-principles that pertain to satisfying requirements for the use of a WBS. Which of the following are these two sub-principles?

A.) Hierarchical and Lucid
B.) Well Formatted and Scope Relevant