1. Which of the following is/are correct about bonds? Select all that apply.

a. All coupon bonds pay coupons semi-annually.

b. Price of a zero-coupon bond approaches its face value as the bond approaches maturity, all else the same.

c. If a zero-coupon bond's yield-to-maturity is negative, its price exceeds its face value.

d. Face value of a zero-coupon bond goes up as the bond approaches maturity.