A project manager for Durable Construction Co. is about to build a house involving the following activities: Activity Immediate Predecessor(s) Durations (days) Optimistic Most likely Pessimistic Start A Start 44 50 56 B Start 45 60 75 C A 42 45 48 D A, B 31 40 49 E C 27 36 39 F E, D 58 70 82 End What is the estimated expected (mean) duration for activity E? O a. 35 days O b. 36 days O c. 39 days O d. 40 days Oe 45 days