QUESTION FOUR [25] A Network Diagram for a project you are managing is presented below: 4.1 Calculate the Early Start; Late Start; Early Finish \& Late Finish for all activities. (15) 4.2 Compute the "slack" time for each activity. (5) 4.3 Identify all the paths and the Critical Path. (5) Please note that you can use a table format (shown below) to answer question 4.1 and 4.2