1) Shirley Hopkins is developing a program in leadership training for middle-level managers. Shirley has listed a number of activities that must be completed before a training program of this nature could be conducted. The activities, immediate predecessors, and times appear in the accompanying table: (20p) Activity Immediate Predecessor(s) Time (days) ABCDEFO 2 5 1 B 10 A, D 3 C 6 G E, F 8 a) Develop an activity on node (AON) network this problem. (5p) b) What is the critical path? (5p) c) What is the total project completion time? (5p) d) What is the slack time for each individual activity? (5p)