JC Inc. must install a new air-conditioning unit in its main plant. It is evaluating two different models: A and B; both are expected to last six years and are equally efficient. The cash flows (in millions) are listed below. JC's WACC is 7.5%. What unit would you recommend? If WACC changes to 9.5%, which unit would you recommend? t = 0 1 2 3 4 5 6 A -525 -25-25-50-50-75-75 B |-175 -75 -125 -125 -150 - 150 - 150 OA:A O Indifferent OA:B OB:A ;