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: $[[,,],[$Activity$,$Immediate Predecessor$($s$),$Time $($days$)],[$A$,-,10],[$B$,-,7],[$C$,-,3],[$D$,$B$,2],[$E$,$A$,$ D$,4],[$F$,$C$,6],[$G$,$E$,$ F$,12]]$ This exercise contains only parts b$,$c $,$ and d $.$ b$)$ The critical activities for the leadership training prog c$)$ The project length for the leadership training program development project $=26$ days. d$)$ Slack time for each of the activities is: $[[$Activity$,$Slack Time$],[$A$,0],[$B$,1],[$C$,5],[$D$,1],[$E$,0],[$F$,5],[$G$,0]]$