17. Which one of the following bonds has the lowest interest rate risk? (a) 5-year; 9 percent coupon; AAA credit rating (b) 5-year; 7 percent coupon; AAA credit rating (c) 7-year; 7 percent coupon; AA credit rating (d) 9-year; 9 percent coupon; A credit rating (e) 9-year; 7 percent coupon; AA credit rating 9-year; 5 percent coupon; AAA credit rating