What is the IP address of the router's Etherneto?

A $192\mathrm{.}168\mathrm{.}10\mathrm{.}33/279$

B

$192\mathrm{.}168\mathrm{.}10\mathrm{.}43/29$

$192\mathrm{.}168\mathrm{.}10\mathrm{.}33/27$

D $192\mathrm{.}168\mathrm{.}10\mathrm{.}43/27$