Which of the following statements is true? I. Incremental analysis is an analytical approach that focuses only on those revenues and costs that will not change as a result of a decision. II. When expressed on a per unit basis, fixed costs can mislead decision makers into thinking of them as variable costs. II. To estimate what the profit will be at various levels of sales volume, multiply the number of units to be sold above or below the break-even point by the onit contribution margin. Statements I and III are true. Statements II and III are true. All of the statements are true. None of the statements are true