I need help with d-2! TIA.

The following CPM network has estimates of the normal time in weeks listed for the activities: B4 a. Identify the critical path. O A-B-D-E-G OA-C-D-F-G A-B-D-F-G OA-C-D-E-G b. What is the length of time to complete the project? Number of weeks 27 c. Which activities have slack, and how much? OC, 3 week(s); F, 4 week(s). OD, 2 week(s); E, 4 week(s). OC, 3 week(s); E, 5 week(s). DOC, 2 week(s); E, 2 week(s). Here is a table of normal and crash times and costs. a NORMAL CRASH NORMAL CRASH ACTIVITY TIME TIME COST COST A 6 5 $ 6,800 $ 8,400 B 5 4 5,800 8,700 3 2 8,400 11,400 D 7 5 2,200 4,700 E 4 3 2,100 3,600 F 6 5 5.400 7,500 G 3 2 3,900 5,300 d-1. Which activities would you shorten to cut two weeks from the schedule in a rational fashion? DODG OCE OBD ODF d-2. What would be the total incremental cost? Total incremental cost $ d-3. Is the critical path changed? O Yes O No