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?

  1. C is critical and has zero slack.
  2. C is not critical and has slack times.
  3. B is a critical activity.
  4. D is a critical activity.
  5. E is a critical activity.
  6. None of the above.

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