Malone Inc. has identified five potential new processes; however, the firm is constrained by its available budget and human resources. Each process is expected to generate a return (given by the net present value) but requires a fixed amount of cash and personnel. Because the resources are limited, all processes cannot be selected. Processes cannot be partially completed; thus, either the process must be undertaken completely or not at all. The data are given in the table below. If a process is selected, it generates the full value of the expected return and requires the full amount of cash and personnel shown in the table. Define Xi = 1 if process i is selected, and 0 otherwise.

	Process 1	Process 2	Process 3	Process 4	Process 5	Available Resources
Expected Return (NPV)	$90,000	$110,000	$75,000	$70,000	$100,000
Cash requirements	$27,500	$41,500	$12,000	$24,500	$61,000	$150,000
Personnel requirements	5	3	2	5	3	12

Determine the expression that explains the personnel limitation.

A) 5X1+ 3X2 + 3X5 ? 12 B) 5X1+ 3X2 + 3X5 ? 12 C) 5X1 + 3X2 + 2X3 + 5X4 + 3X5 ? 12 D) 5X1 + 3X2 + 3X3 + 5X4 + 2X5 ? 12