A zero$-$coupon bond trades at $$987\mathrm{.}24.$ If the bond matures after $4$ years and

has a par value equal to $$1,000,$ its yield to maturity is:

$($a$)3\mathrm{.}25\%.$

$($b$)2\mathrm{.}05\%.$

$($c$)0\mathrm{.}322\%.$

$($d$)$ None of the above answers is correct.