6. A project has the following activities. By constructing an A-O-A network, identify the critical path and compute the slack associated with all the non-critical activities. Prepare an activity schedule showing the ES, EF, LS, LF and slack for each activity. (10 marks) Preceding Activity Duration (weeks) Activities A 5 B A 2 A 6 D B 12 E D 10 F D 9 G 5 H B 9 C, E 1 G 2 K F,1,J 3 L K 9 M HG 7 N M 8