Company Saluki issued a $30$ year bond $5$ years ago, and below are the information for the bond. What is the cost of debt?

$--$ Semi$-$annual coupon payments

$--6\%$ coupon, $$100$ par$/$face value

$--$currently selling for $$105$

$2\mathrm{.}8125\%$

$5\mathrm{.}625\%$

$5\mathrm{.}6502\%$

$2\mathrm{.}825\%$