Which subnet masks would be valid for a subnetted Class B address? $($Select Two$)$

$255\mathrm{.}254\mathrm{.}0\mathrm{.}0$

$255\mathrm{.}224\mathrm{.}0\mathrm{.}0$

$255\mathrm{.}255\mathrm{.}0\mathrm{.}0$

$255\mathrm{.}255\mathrm{.}252\mathrm{.}0$