A small manufacturing firm has developed the following list of activities necessary to release a contract for a new plant. Immediate Activity predecessor time (days) A (1-2) B (1-3) C (1-4) D (2-3) E (2-5) F (3-5) G (3-6) Н(4-6) I (5-6) J (6-7) 67. Which activities are on the critical path ? a. A-E-I-J 6. 5 ? (a = 3; m = 4; b = 5) 4 B,D B,D 6. E,F G,H,I 3 2 b. A-D-F-I-J d. A-D-G-J c. B-G-J е. С-Н-J 68. The expected completion time of this project is: b. 17 c. 19 d. 20 e. None a. 16 69. In the CPM/PERT chart, the ES and LF for the activity F(3-5) is: c. 7, 11 d. 11, 16 b. 6, 11 a. 2, 11 e. None 70. In the CPM/PERT chart, the slack time for activity B(1-3) is: b. 3 d. 0 a. 1 c. 5 e. None