please answer from a until i with the solving steps

CHAPTER 13 / Developing and implementing Effective Accounting Information Systems 431 14 FIGURE 13-11 PERT network diagram for a systems implementation project. 13-19. Do you understand PERT charts? Refer back to Figure 13-11 and answer the following questions: a. Which activity or activities must be completed before activity C can begin? b. Which activity or activities must be completed before activity G can begin? c. Which activity or activities must be completed before activity can begin? d. What are the five paths through the network? Which one is the critical path? e. What is the earliest projected start time for activity F? 1. What is the earliest projected start time for activity G? g. What is the latest time that activity J can begin without delaying the entire project? h. What is the latest time that activity G can begin without delaying the entire project? 1. What is the slack time for activity G? (Hint: it's the difference between the early and late start times.)