A project with time uncertainty has work breakdown structure, precedence relationships, and activity times as follows. Assume that activities are started as early as possible, i.e. no delays. ID IP Activity Time (months) 8 B 5 4 months with probability of 0.4 7 months with probability of 0.1 9 months with probability of 0.5 (a)[5] What is the shortest project completion time among the three possible scenarios? (For example: enter 15 for 15 months) (b)[5] What is the longest project completion time among the three possible scenarios? (For example: enter 15 for 15 months) (c)[5] What is the expected project completion time? (A weighted average among the three scenarios with probabilities specified in the table) (For example: enter 13.64 for 13.64 months)