Ten years ago, Disney sold a noncallable bond currently has 20 years to maturity. This bond has a 9.25% coupon rate, and coupons are paid semiannually. The bond's par value is $1,000, and it currently sells for $875. The firm's tax rate is 25%. If Disney is computing its WACC, what is the after-tax cost of debt it should use in its calculations? a. 4.04% b. 8.09% c. 6.47% O d. 9.25% e. 6.94%