Question 21 2 pts Which of the following rules about creating a WBS is NOT correct? There should be no overlap in scope definition between two elements of a WBS. A WBS should include 100% of the work necessary to complete the goal. A WBS should show the dependency of the tasks at the same levels. A WBS should not account for any amount of work twice. Question 22 2 pts Which of the following choices are NOT likely to be considered in a use case narrative? the pre-conditions and post-conditions of the system functionality the system input and output other use cases that are related to the focal use case the primary actor(s) involved in the focal use case