A project network consists of the following list. Times are given in weeks. (10 points) Activity Preceding Duration A -- 7 B A 3 C A 4 D A 5 E B 6 F B, C 8 G H, E 6 H D 2 I C 6 J F, I 3 K G, J 2 a. Draw the network diagram. b. Which activities form the critical path? c. How much slack exists at activities A and F? d. What is the duration of the critical path?