A simple CPM network has three activities, D, E, and F. D is an immediate predecessor of E and of F. E is an immediate predecessor of F. The activity durations are D=4, E=3, F=8. Which is the correct answer:
a) The critical path is D-E-F, duration 15.
b) The critical path is D-F, duration 12.
c) Slack at D is 3 units
d) Slack at E is 3 units
e) Both The critical path is D-E-F, duration 15 and Slack at D is 3 units are true