Which of the following is correct regarding contribution margin? A. The unit contribution margin is calculated by subtracting variable costs per unit from the sales price per unit. B. Companies that sell more than one product can disregard sales mix when performing CVP analysis OC. The contribution margin income statement is organized by cost function. OD. The variable cost percentage represents the amount from each unit sale that covers variable costs. OE. The total contribution margin tells managers the amount which sales revenue exceeds cost of goods sold