【单选题】
A It describes how WBS Dictionary entries are traced to work packages, and how work packages are decomposed from deliverables
B It’s used to make sure that all of the sub-plans of the Project Management Plan have been created
C It helps you understand the source of each requirement, and how that requirement was verified in a later deliverable
D It’s used to trace the source of every change, so that you can keep track of them through the entire Control Scope process and verify that the change was properly implemented
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