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 definitely TRUE

A. The set of times cannot all be possible.

B. R has no slack but is not critical.

C. S is a critical activity.

D. R is critical and has zero slack.

E. N is a critical activity.

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