In the Program Evaluation Review Technique $($PERT$),$ slack is the

Question $17$ options:

a$)$

excess time available after the completion of an activity which contributes to path completion before the entire project is completed.

b$)$

path that has the largest amount of time associated with it$.$

c$)$

number of days an activity's duration can be reduced by crashing.

d$)$

uncertainty associated with time estimates.