|A) A WBS hierarchy prevents duplication||B) A WBS cab be rolled up or collapsed to provide information at the appropriate level for a particular audience.|
|C) The decomposition of tasks provides a detailed planning tool||D) The depth of a WBS is restricted to three levels, which avoids overplanning|
Answer A is incorrect because the WBS hierarchy does not prevent duplication by itself. Answer C is incorrect because a WBS is focused on deliverables and components or work packages and not on tasks. Answer D is incorrect because a WBS can be sized appropriately to the project size with as many levels as necessary.