When identifying an earlier project completion time, which is to be obtained by paying a premium for early completion, the activities that should be selected are those:
A. whose sum of activity time is the shortest.
B. that have zero slack time.
C. that give the longest possible completion time.
D. whose sum of slack time is the shortest.
A. whose sum of activity time is the shortest.
B. that have zero slack time.
C. that give the longest possible completion time.
D. whose sum of slack time is the shortest.