A company's non callable bonds have a $1,000 par value, were issued several years ago and now have 20 years to maturity. These bonds have a 7% annual coupon, paid semiannually and currently sell for $925. The firm's tax rate is 40&. What is the cost of the debt that should be used in the WACC calculation? a. 4.28%, b. 4.46%, c. 4.65%, d. 4.83%, e. 5.03%