Which of the following statements is correct with regard to a CVP graph? (2.5) 1) A CVP graph shows the maximum possible profit. 2) A CVP graph shows the break-even point as the intersection of the total sales revenue line and the total expense line. 3) A CVP graph assumes that total expense varies in direct proportion to unit sales. 4) A CVP graph shows the operating leverage as the gap between total sales revenue and total expense at the actual level of sales.