3a Construct an activity network diagram using Table 3a. (5marks) Activity A B C D E F G Predecessors - - A A,B D C,E E Expected Time(WKS) 7 9 12 8 9 6 5 Table 3a Activity Durations and relationship i. Conduct a forward and backwards pass for the activity network diagram that you have constructed and identify the critical path and its duration. (10 Marks) ii. Calculate the slack on all of the activities, and proceed to analyze how knowing the slacks can help to manage schedule risk the a project 3b. Assuming that there is the risk of exceeding the project schedule baseline for 7 weeks, critically evaluates the options available that could be used to bring the project on track