COM Company produces a part that is used in the manufacture of one of its products. The unit manufacturing costs of this part, assuming a production level of 6,000 units, are as follows: Direct materials Direct labor Variable manufacturing overhead Fixed manufacturing overhead Total cost $4.00 $4.00 $3.00 $1.00 $12.00 The fixed overhead costs are unavoidable. Assuming COM Company can purchase 6,000 units of the part from SON Company for $14 each, and the facilities currently used to make the part could be rented out to another manufacturer for $24,000 a year, what should COM Company do? a. Make the part and save $2.00 per unit. b. Make the part and save $6.00 per unit. OC. Buy the part and save $2.50 per unit. Od Buy the part and save $2.00 per unit. O e Buy the part and save $1.00 per unit