Please help me with the right option

Which of the following statements about operating leverage is false? O a. All of the given answers are true. O b. Operating leverage measures how operating income will be affected by changes in sales O c. The degree of operating leverage is higher for companies with lower fixed costs O d. If the degree of operating leverage higher for a company, this means that the company is more risky than another company with low degree of operating leverage. O e. Keeping all factors constant, the higher the contribution margin, the higher the operating leverage