With respect to fixed costs per unit, which of the following statements is true? A. They will increase as volume increases, within the relevant rage. O B. They will decrease as volume decreases, within the relevant range. C. They remain the same as volume levels change, within the relevant range. D. They will decrease as volume increases, within the relevant range. With respect to total variable costs, which of the following statements is true? O A. They will increase as volume decreases, within the relevant range. B. They remain the same as volume levels change, within the relevant range. O C. They will decrease as volume increases, within the relevant range. 0 D. They will increase as volume increases, within the relevant rage