Vibrato Jazz Co. has a bond issue outstanding that matures in 14 years. These $1000 face value bonds pay interest annually. Currently, the bonds are quoted at 93 percent of face value and carry a 7 percent coupon. What is the firm's after-tax cost of debt If the tax rate is 22 percent? (Choose the closest answer, your answer may vary very slightly based on rounding) Select one: a. 5.81 percent b. 7.84 percent c. 6.12 percent d. 6.42 percent