What is the subnetwork address for a host with the IP address $200\mathrm{.}10\mathrm{.}5\mathrm{.}68/28?$

$200\mathrm{.}10\mathrm{.}5\mathrm{.}56$

$200\mathrm{.}10\mathrm{.}5\mathrm{.}64$

$200\mathrm{.}10\mathrm{.}5\mathrm{.}32$

$200\mathrm{.}10\mathrm{.}5\mathrm{.}0$