A router has the following IP address $187\mathrm{.}20\mathrm{.}2\mathrm{.}244/23.$ Which of the following addresses can be a valid address of a host on the LAN interface connected to the router?$(2$ points$)$

a$.187\mathrm{.}20\mathrm{.}1\mathrm{.}89$

b$.187\mathrm{.}20\mathrm{.}3\mathrm{.}56$

c$.187\mathrm{.}20\mathrm{.}2\mathrm{.}4$