please answer all parts, will upvote upon completion

Roger Ginde is developing a program in supply chain management certfication for managers. Ginde has listed a number of activilies 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: This exercise contains only parts b,c, and d b) The critical activities for the leadership training program development project are c) The project length for the leadership training program development project = days d) Slack time for each of the activities is: This exercise contains only parts b,c, and d. b) The critical activities for the leadership training program development project are c) The project length for the leadership training program development project = days. d) Slack time for each of the activities is