Please explain.

Suppose a firm's degree of financial leverage (DFL) is 1.0. Which of the following statements concerning this firm is correct? O a. The firm's degree of total leverage (DTL) must equal 1.0. O b. The firm's earnings per share (EPS) must equal zero. O c. The firm's degree of operating leverage (DOL) must be greater than 1.0. Od. The firm must have fixed costs associated with its production process. O e. The firm has no long-term debt, preferred stock, or other sources of financing that require fixed payments