Which of the following bonds would have the highest required rate of return assuming each bond has the same time to maturity? a. A BB-rated callable bond b. A BB-rated non-callable bond C. An AA-rated callable bond d. An AA-rated non-callable bond Which of the following bonds would have the most re-investment rate risk? a. A 20-year zero coupon bond. b. A 10-year, 10% coupon bond. C. A 20-year, 10% coupon bond. d. A 10-year, zero coupon bond