Which of the Following Statements Regarding Margin of Safety Is

Which of the following statements regarding margin of safety is correct?

A) The margin of safety can be measured in sales dollars or in units and is the difference between actual or projected sales and break-even sales.
B) The margin of safety can be measured in sales dollars or in units and represents the point at which a company begins to earn income from operations.
C) The margin of safety can be measured in sales dollars or in units and represents the point at which contribution margin exceeds variable costs and expenses.
D) The margin of safety can only be measured in sales dollars and represents the point at which the gross profit margin exceeds targeted levels of fixed costs and expenses.