Consider a 9% coupon bond selling for 97.65 with 4 years until maturity making annual coupon payments. The spot rate for 1 year maturity is 7.76 % and short rates for years 2, 3 and 4 are 9.96%, 12.71% and 13.46% respectively. Calculate realized compound yield of the bond. a. 11.91% b. 11.21% c. 12.91% O d. 12.46% e. 9.88%