A project consists of the activities in the following list. Times are given in weeks. Activity Preceding Time A -- 8 B -- 4 C A, B 7 D A, B 3 E C, D 5 F C, D 6 G E, F 4 a. Draw the project network diagram. (AON) b. Calculate each activity's ES, EF, LS, LF, and Slack using the project activity nodes on the project network diagram. c. What is the project completion time? d. Identify the critical path