Read the following statements about the total cost (TC), marginal cost (MC), and average cost (AC) of a good, and select the correct option(s). Question 4 options: When MC > 0, TC decreases. When MC = 0, AC increases. When AC decreases, MC must be smaller than AC. MC and AC are independent of each other. MC can never be equal to AC. When AC decreases, TC can still increase. Question 5 (1 point)