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?
a. D is critical, and has zero slack.
b. D has no slack but is not eritical.
c. C is completed before B.
d.B is a critical activity.
Activity D on a CPM network has predecessors B and C,

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