You are implementing a VPN server. Your internal network IP address range is $192\mathrm{.}168\mathrm{.}0\mathrm{.}1$ to $192\mathrm{.}168\mathrm{.}0\mathrm{.}254.$ Which of the following should not be used on the network at the other end of the VPN tunnel?

Question $10$ options:

$192\mathrm{.}168\mathrm{.}0.$x

$192\mathrm{.}168\mathrm{.}1.$x

$172\mathrm{.}16.$y$.$z

$10.$x$.$y$.$z