Given the activities described by the following table: Immediate Predecessor(s) Activity A Standard Deviation of Time Estimate 2 Expected Time 7 B 3 1 C 9 4 3 1 D E 5 1 A A B, C B, C E D, F G 8 F G 2 1 8 6 H 2 a) Choose the appropriate PERT diagram below. O A. B. B D B B D G H H H E E E F b) The critical path is The project completion time is c) Using the standard normal table, the probability that the project will take more than 49 time periods to complete is (enter as a probability and round your response to four decimal places)