Which of the following statement is incorrect?

a. Interest rate risk is the risk that bond prices will fluctuate as interest rate changes.

b. Bonds with low coupon payments have greater interest rate risk.

c. The required rate of return, or discount rate, for a bond is the market interest rate called the bond's yield to maturity.

d. Bonds with a call provision pay lower yields than comparable noncallable bonds.

e. Most of the answers are correct except one.