The operations manager of a mail order house purchases double (D) and twin (T) beds for resale. Each double bed costs $500 and requires 100 cubic feet of storage space. Each twin bed costs $300 and requires 90 cubic feet of storage space. The manager has $75,000 to invest in beds this week, and her warehouse has 18,000 cubic feet available for storage. Profit for each double bed is $300 and for each twin bed is $150. The manager's goal is to maximize profits. What is the objective function? Question 9 options: A) P = 150D + 300T B) P = 100D + 90T C) P = 500D + 300T D) P = 300D + 500T E) P = 300D + 150T