A new activity (Activity H) has been added as a necessary task to be completed in the project and it has a duration of 3.5 and Activities F and G must be completed before Activity H can begin.

All the given activity durations have variance 0.

The project manager needs to reduce the project completion time to 12 days with minimum extra cost. He has developed an LP model to help him make the crashing decision. The necessary parameters and decision variables are defined as following:

M_i = maximum possible activity time reduction for activity i

K_i = cost per unit of time reduction for activity i

T_i = start time for activity i

C_i = the amount of time by which activity i is crashed

Which of the constraints are necessary in the LP model?

1. I. T_B T_E C_B
2. II. T_F C_F
3. III. C_i i for all i
4. IV. T_H C_H

		A. I, II, and III
		B. I, II, III, and IV
		C. I, III, and IV
		D. II, III, and IV

Consider the following project network. Finish Activity Duration