Which is true about sinking fund bonds?

These bonds include a requirement that the issuer retires a certain portion of the entire issue every year hence offer a

relatively higher interest rate $.$

These bonds allow the issuer to force the bond holders to sell the bond back to the issuer at the call price.

These bonds include a requirement that the issuer retires a certain portion of the entire issue every year hence offer a

relatively lower interest rate.

These bonds gives the bond holders the right to purchase the firm's common stock at a specified price up to a specified

date.