A company has outstanding bonds with a 10-year maturity date and a face value of $1,000. The bonds have an annual coupon payment of $80 and current market price of $1,155. If the company has a marginal tax rate of 22%, what would be a reasonable estimate of their after-tax cost of debt? O a 1.7% O b. 1.8% O c 4.6% O d. 5.1% O e. 5.4%