Which of the following statements about CVP analysis is false? O a. Unit selling price, unit variable costs, and total fixed costs are known and remain constant. O b. Operating income calculations in CVP analysis are based on contribution margin not gross margin. c. All of the given answers are true. Od. Total revenues and total costs are linear in relation to output units. Oe. Managers use (CVP) analysis to study the behavior of and relationship among the elements such as total revenues, total costs, and income