Task Immediate Duration (Days) Predecessors None (2 points) a. What is ES, EF, LS, LF for activity D? (3 points) b. What is the critical path, and what is the length of critical path? (3 points) c. If activity B were delayed by two days, what would happen to the project duration? (4 points) d. If the customer would like to crash the CPM network by a day, which activity should be crashed first? How much was adding to the project cost? (Crash cost information given below, activity D and E cannot be crashed) Activity Normal Time Normal Cost Crash Time Crash Cost 5 days $6,000 3 days $6,800 3 days $4,100 2 days 3 days 4 days $5,500 $4,000 $5,000 $3,000 $2,500 2 days NA NA E 1 day NA NA