If the yield to maturity of all the following bonds is 6%, which will trade at the greatest premium per $100 face value?

a. a bond with a $1,000 face value, 5 years to maturity, and 6.3% annual coupon payments

b. a bond with a $10,000 face value, 4 years to maturity, and 6.2% semiannual coupon payments

c. a bond with a $5,000 face value, 7 years to maturity, and 5.5% annual coupon payments

d. a bond with a $500 face value, 7 years to maturity, and 5.2% annual coupon payments