moby corporation has a target capital structure of 50% common stock, 5% preferred stock and 45% debt. Its cost of equity is 8% the cost of preferred stock is 6% and the pretax cost of debt is 4%. The tax rate is 35%. What is the company's WACC?

a.2.37%

b.5.47%

c. 10.30%

d. 9.41%