Which of the following is a private IP address?

Group of answer choices

$20\mathrm{.}259\mathrm{.}31\mathrm{.}0$

$99\mathrm{.}99\mathrm{.}99\mathrm{.}99$

$172\mathrm{.}18\mathrm{.}25\mathrm{.}255$

$193\mathrm{.}23\mathrm{.}35\mathrm{.}2$