You were hired as a consultant to Giambono Company, whose target capital structure is 40% debt, 15% preferred, and 45% common equity. The after-tax cost of debt is 6.00%, the cost of preferred is 7.50%, and the cost of retained earnings is 12.00%. The firm will not be issuing any new stock. What is its WACC?

a. 7.59%

b. 8.93%

c. 7.68%

d. 6.69%

e. 6.96%