4. Consider the following data for a project to install a new server at the Northland Pines High School: Activity Activity Time (days) Immediate Predecessor(s) > C-IOTO a. Choose the correct network diagram below. OA S- - - - OD b. Calculate the critical path for this project. The critical path is (1) - as a whole number.) - and the project duration is days. (Enter your response c. How much slack is in each of the activities G, H, and I? Activity Activity Time (days) On critical path? Slack (days) (2) (2) No Yes (3) Yes O No (4) (1) O A-B-F-H-J O A-B-E-G-J O A-B-D-G-J O A-C-F-I-J O A-B-F-I-J O A-C-F-H-J No Yes O O