Refer to the following graph when answering this question. Marginal cost (SMC) Cost or revenue ($) 7 9 Rakes per minute e 12 Average total cost (SATC) Marginal revenue = price 13. In order to maximize profit, the firm should produce: a. 7 rakes per minute, where marginal cost is minimum. b. 9 rakes per minute, where average total cost is minimum. c. 12 rakes per minute, where marginal revenue equals marginal cost. d. Any of the above, if cost is minimized