Which of the following statements is correct?

a$)$ There are cases of fixed$-$rate bonds where the coupon rate varies over time.

b$)$ Fixed$-$rate bonds always pay constant coupons.

c$)$ A holder of a capitalized bond receives periodic coupon payments.

d$)$ Capitalized bonds eliminate credit risk.

e$)$ Issuers of capitalized bonds do not pay interest.