need help with these 2

A sinking fund provision on a bond issue requires the issuing corporation to: O is not a desirable feature of a bond from the viewpoint of the creditors O is generally required of callabe bonds O Buy back a percent of its bonds on an annual basis Is generally required of convertible bonds A bond with 8 years to maturity makes semiannual payments and has a coupon rate of 8% and a current market rate of 9%. What is the bond's current price? $1,505.53 $1,393.19 O $1,058.26 0 $943.83