Question: Activity R on a PERT network has predecessors M and N, and has successor S. The duration (t) of R is 5. Late finish (LF)

Activity R on a PERT network has predecessors M and N, and has successor S. The duration (t) of R is 5. Late finish (LF) of N is 18, while late finish (LF) of M is 20. Late start (LS) of S is 14. Which of the following is definitely true?(2 Points)

R is critical and has zero slack

R has no slack but is not critical

S is a critical activity

N is a critical activity

the set of given times cannot all be possible

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