Assume that the current spot yield curve for the next four years is the following: y1=4%,y2=5%,y3=6%, and y4=6.5%. What is the yield-to-maturity of a 10% coupon bond that matures in 4 years closest to? Assume cash flows are paid, and interest is compounded, annually. \begin{tabular}{|c|} \hline 6.65% \\ \hline 6.34% \\ \hline 6.45% \\ \hline 6.31% \\ \hline 6.02% \\ \hline \end{tabular}