A network advertises the CIDR network number $50\mathrm{.}1\mathrm{.}56\mathrm{.}0/22($and no other numbers$).$ Which IP addresses could the network own?

$($a$)50\mathrm{.}1\mathrm{.}57\mathrm{.}0($b$)50\mathrm{.}1\mathrm{.}59\mathrm{.}1($c$)50\mathrm{.}1\mathrm{.}60\mathrm{.}0$

$($d$)50\mathrm{.}1\mathrm{.}120\mathrm{.}0$