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