$1.$ According to the theory of covered interest rate parity $($CIRP$),$ what should be the approximate Swiss Franc $60-$day interest rate? $\_\_\_\_\_\_\_\_\_\_\_\_\_.$

$($a$)0\mathrm{.}1\%$

$($b$)0\mathrm{.}3\%$

$($c$)0\mathrm{.}5\%$

$($d$)0\mathrm{.}7\%$