The one$-$year interest rate is $4\%.$ The interest rate for a two$-$year security is $6\%.$ According to the unbiased expectations theory, the one$-$year interest rate one year from now must be equal to

Group of answer choices

$10\mathrm{.}40\%$

$7\mathrm{.}6\%$

$10\mathrm{.}00\%$

$8\mathrm{.}04\%$