20   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 14. Which of the following is definitely true?         Select one: a. The set of times cannot all be possible. b. S is a critical activity. c. R has no slack but is not critical d. N is a critical activity e. R is critical and has zero slack

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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 14. Which of the following is definitely true?      


 

Select one:
a. The set of times cannot all be possible.
b. S is a critical activity.
c. R has no slack but is not critical
d. N is a critical activity
e. R is critical and has zero slack
 
 
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