The broadcast address for a host at $192\mathrm{.}168\mathrm{.}20\mathrm{.}15$ using a subnet mask of $255\mathrm{.}255\mathrm{.}255\mathrm{.}192$ is

Group of answer choices

$192\mathrm{.}168\mathrm{.}20\mathrm{.}0$

$192\mathrm{.}168\mathrm{.}20\mathrm{.}63$

$192\mathrm{.}168\mathrm{.}20\mathrm{.}127$

$192\mathrm{.}168\mathrm{.}20\mathrm{.}255$

none of the above