Which of the following statements about margin of safety is false? F O a. If only the variable cost per unit increases but the number of units sold and unit selling price and fixed cost are all constant, the margin of safety decreases. O b. Margin of safety measures the difference between budgeted revenues and breakeven revenues. O cIf only the fixed costs increase but the number of units sold and unit selling price and unit variable cost are all constant, the margin of safety increases. Od none of the given answers is false. Oe. If the variable cost per unit decreases but the number of units sold, unit selling price and total fixed cost are all constant, the margin of safety increases