QUESTION 4 The following network diagram and the table that shows the normal times and the crash times, along with the associated costs for each activity, represent a project. a) If the project is to be shortened by four days, show which activities, in order of reduction would be shortened and the resulting cost. b) What is the total cost to reduce the project by four days? c) What is the Total cost to complete the project if the project is to be reduced by four days? [15].