If the current $2-$year interest rate is $5\%$ and the expected $1-$year interest rate two years from now is $4\mathrm{.}7\%,$ what is the interest rate on $3-$year bond today according to the expectations theory?

$6\mathrm{.}3$ percent.

$3\mathrm{.}23$ percent.

$4\mathrm{.}9$ percent.

$4\mathrm{.}85$ percent.