Which of the following statements is true for a CPM network? O a. The slack of all the activities is zero. O b. The slack of all the activities on the critical path is zero. The slack of all the activities is positive. The slack of all the activities is non-zero. The slack of activities on the critical path is negative. O c. O d. Oe.

Which of the following statements is true for a CPM network? a. The slack of all the activities is zero. b. The slack of all the activities on the critical path is zero. c. The slack of all the activities is positive. d. The slack of all the activities is non-zero. e. The slack of activities on the critical path is negative