Variable cost per unit $10.00$12.00 The products are machine made. Three units of product A can be made with one machine hour and two units of product B can be made with one machine hour. The company has maximum of 3,000 machine hours available per month. The company can sell up to 18,000 units of product A per month. And up to 3,000 units of product B for the month. What is the optimum product mix to maximize company's operating income? A. 1,500 units of A and 60,000 units of B B. Zero units of A and 3,000 units of B C. 4,500 units of A and 3,000 units of B D. 12,000 units of A and zero units of B