A project has been defined to contain the following list of activities along with their required times for completion Activity No. Activity Time (weeks) Immediate Predecessors 1 Collect requirements 2 Analyze processes Analyze data Design processes Design data Design screens 7 Design reports Program Test and document Install 2 a. Draw a network diagram for the activities b. Calculate the earliest expected completion time. c. Show the critical path. d. What would happen if activity 6 were revised to take six weeks instead of two weeks