Which of the following statements is true? 1.Residual income cannot be used to compare the performance of divisions of different sizes. 2.All other things the same, an increase in unit sales will normally result in an increase in the return on investment 3.A change in sales has no effect on margin and tumover. (2.5) 1) All of the statements are true. 2) Both statements I and III are true. 3) Both statements I and II are true. 4) None of the statements are true.