A firm maintains a Debt to equity ratio of 0.63 and has a tax rate of 40%. The company does not issue preferred stock but has a pre-tax cost of debt of 9.75%. There are 20000 shares of the company's stock outstand with a beta of 0.9 and a market price of $43.80. Yesterday, the company issued an annual dividend in the amount of 1.03 per share. Dividends are expected to grow at 5.70% forever. What is the company's WACC? a. 6.55% b. 6.74% c. 6.92% d. 7.10% e. 7.28%