please answer A,B,C,D,E,F,G

Roger Ginde is developing a program in supply chain management certification for managers. Ginde 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: Immediate Predecessor(s) Activity A Time (days) 3 6 B 1 10 E 4 B A, D E, F F 5 G 10 This exercise contains only parts b, c, and d. b) The critical activities for the leadership training program development project are B-D-E-G. c) The project length for the leadership training program development project = 30 days. d) Slack time for each of the activities is: Slack Time Activity A