A simple network has five activities, A, B, C, D and E. A is an immediate predecessor of B and of C. B is an immediate predecessor of E. cis an immediate predecessor of D. The activity durations are A= 10, B = 3, C= 6, D = 2 and E= 3. a) The critical path is A-B-E, duration 16. b) The critical path is A-B-C, duration 19. c) The critical path is A-B-D, duration 15. d) The critical path is A-C-D, duration 18. e The network has no critical path