Which of the following is true? a.Holding other things constant, the duration of a bond decreases with time to maturity. b. Given time to maturity, the duration of a zero-coupon increases with yield to maturity. c. Given time to maturity and yield to maturity, the duration of a bond is higher when the coupon rate is higher. d. Duration is a better measure of price sensitivity to interest rate changes than is time to maturity. e. Given time to maturity and yield to maturity, the duration of a bond is higher when the coupon rate is lower, and duration is a better measure of price sensitivity to interest rate changes than is time to maturity.