Mighty Safe Fire Alarm is currently buying 55,000 motherboards from MotherBoard, Inc., at a price of $63 per board. Mighty Safe is considering making its own boards. The costs to make the board are as follows: direct materials, $28 per unit; direct labor, $11 per unit; and variable factory overhead, $14 per unit. Fixed costs for the plant would increase by $74,000. Which option should be selected and why? Oa, make, $550,000 increase in profits Ob. buy, $475,750 increase in profits Oc, buy, $74,000 increase in profits Od. make, $475,750 increase in profits