A 4 B A 3 2 3. Here are the precedence requirements, normal and crash times and costs for a construction project. Preceding Time (weeks) Cost ($) Activity Activity Normal Crash Normal Crash 3 10,000 11,000 6,000 9,000 5 4,000 6,000 D B 5 3 14,000 18,000 E D,C 3 1 9,000 10,000 (a) Draw the AON network, find the critical path and the estimated completion time. (2 points) (b) How much slack time does Activity C have without delaying the project completion time? (c) To shorten the project by one week, which activity would be shortened and what would the final total project cost be? (2 points) A 1