Avtek has received a quantity discount pricing schedule, as shown in the table below. The annual carrying cost for each unit is $190, the ordering cost i $2500, and the yearly demand for this item is estimated to be 200 units. How should Avtek place its orders? Quantity Unit price 1-89 $ 1,400 90+ $ 1,100 Select one a. None of them. b Avtek should place orders of 65 units as the minimum total cost is $155.670. c. Avtek should place orders of 90 units as the minimum total cost is $194,106. d Avtek should place orders of 90 units as the minimum total cost is $234,106 e Avtek should place orders of 73 units as the minimum total cost is $293.784