Question: Activity C on a CPM network has predecessors A and B, and has successor D and E. C has duration 5. B's late finish is

Activity C on a CPM network has predecessors A and B, and has successor D and E. C has duration 5. B's late finish is 18, while A's is 20. D's late start is 14, while Es is 16. Which of the following is definitely true?

A. C is critical and has zero slack.

B. C is not critical and has slack times.

C. B is a critical activity.

D. D is a critical activity.

E. E is a critical activity.

F. None of the above.

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