The Cloud Corporation uses debt, preferred stock, and common stock to raise capital. The firm's capital structure targets the following proportions: debt, 35%; preferred stock, 15%; and common stock, 50%. If the cost of debt is 8.7%, preferred stock costs 9.2%, and common stock costs 11.5%, what is Cloud’s weighted average cost of capital (WACC)? a. 10.18% b. 2.51% c. 9.11 d. 1.63%