3.9 Task time estimates for the modification of an assembly line at Jim Goodale's Carbondale, Illinois, factory are as follows: TIME (IN ACTIVITY HOURS) IMMEDIATE PREDECESSORS A 6.0 B 7.2 UDE 5.0 A 6.0 B, C 4.5 B, C F 7.7 D G 4.0 E, F a) Draw the project network using AON. b) Identify the critical path. c) What is the expected project completion time? d) Draw a Gantt chart for the project. Px