Lakeside Rentals has thirty-year bonds outstanding that pay an annual coupon of 5 percent. The bonds mature in seven years and are currently priced at 96 percent of face value. What is the firm's pre-tax cost of debt? Select one: O a. 5.27 percent O b.5.63 percent O c. 5.71 percent O d. 5.59 percent O e. 5.68 percent