Schedules and activities of a project are shown below. Answer the questions. Activity Predecessor(s) Duration (days) Activity Predecessor(s) Duration (days) A 5 G B 4 B A 7 H G 2 C A 3 I G 3 D B 3 J C 2 E D 2 K J 3 F E, H 2 L G, K 7 a) Draw a network diagram and find the critical path and project completion time. b) Calculate slack time of the non-critical activities. c) Can activity D be delayed without delaying the project completion time? If so, how many weeks? d) Activity D needs a delayed time of two days and activity E needs two days extra time. Is it possible by keeping the project completion time unchanged? Explain. e) Activity C needs a delayed time of two weeks and activity J needs two days extra time. Is it possible by keeping the project completion time unchanged? Explain. f) The PM wants to shorten the duration of the activity I from 3 weeks to 1 week. What is the impact of this change on the project completion time and critical path?