Question: Activity D on a CPM network has predecessors B and C , and has successor F . D has duration 6 . B ' s

Activity D on a CPM network has predecessors B and C, and has successor F. D has duration 6. B's earliest finish is 18, while C's is 20. F's late start is 26. Which of the following is true?
Group of answer choices
D is a critical activity with ES =20 and EF =26.
All of the above are true.
B is a critical activity.
C is completed before B.

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