Question 3 (1 point) Which of the following statements is true? Mixed costs are step costs....

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Question 3 (1 point) Which of the following statements is true? Mixed costs are step costs. Total variable cost change in direct proportion to changes in the amount of the activity. In the short run, all cost is variable. In the long run, all costs are fixed. Question 3 (1 point) Which of the following statements is true? Mixed costs are step costs. Total variable cost change in direct proportion to changes in the amount of the activity. In the short run, all cost is variable. In the long run, all costs are fixed.