Mallory Furniture buys two products for resale: big shelves (B) and medium shelves (M). Each big shelf costs $500 and requires 100 cubic feet of storage space, and each medium shelf costs $300 and requires 90 cubic feet of storage space. The company has $75,000 to invest in shelves this week, and the warehouse has 18,000 cubic feet available for storage. Profit for each big shelf is $300 and for each medium shelf is $150. a) Which of the following is not a feasible purchase combination? A) 0 big shelves and 200 medium shelves B) 0 big shelves and 0 medium shelves C) 150 big shelves and 0 medium shelves D) 100 big shelves and 100 medium shelves