Which IP address is a unicast address if a default subnet mask is used $??$

$201\mathrm{.}34\mathrm{.}45\mathrm{.}0$

$192\mathrm{.}16\mathrm{.}43\mathrm{.}67$

$226\mathrm{.}34\mathrm{.}15\mathrm{.}78$

$195\mathrm{.}124\mathrm{.}45\mathrm{.}255$