Question: Activity R on a CPM network has predecessors M and N , and has successor S . R h M ' s is 2 0

Activity R on a CPM network has predecessors M and N, and has successor S.R h M's is 20. S's late start is 14. Which of the following is definitely true?
R is critical and has zero slack.
N is a critical activity.
S is a critical activity.
The set of times cannot all be possible.
R has no slack but is not critical.
Activity R on a CPM network has predecessors M and N,

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