Suppose that the total profit in hundreds of dollars from selling x items is given by P(x) = 2x^2 - 4x + 6. Complete parts a through d below. a. Find the average rate of change of profit as x changes from 3 to 5. b. Find the average rate of change of profit as x changes from 3 to 4. c. Find and interpret the instantaneous rate of change of profit with respect to the number of items produced when x = 3. (This number is called the marginal profit at x = 3.) What does this result mean? Choose the correct answer below. A. When 3 items are sold, the profit is decreasing at the rate of $ per item. B. When 3 items are sold, the profit is increasing at the rate of $ per item. C. When items are sold for $ the profit is decreasing at the rate of $3 per item. D. When items are sold for $ the profit is increasing at the rate of $3 per item. d. Find the marginal profit at x = 5.