Question: Activity R on a CPM network has predecessors M and N, and has successor S. R has duration 5. N's late finish is 18, while

Activity R on a CPM network has predecessors M and N, and has successor S. R has duration 5. N's late finish is 18, while M's is 20. S's late start is 22. Which of the following is definitelyTRUE?

Select one:

O A. Sis a critical activity.

O B. R has no slack but is not critical.

O C. Nis a critical activity.

O D. R is critical and has zero slack.

O E. The set of times cannot all be possible.

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