Which of the following is a valid Class A address?

$126\mathrm{.}10\mathrm{.}0\mathrm{.}1$

$128\mathrm{.}10\mathrm{.}0\mathrm{.}1$

$127\mathrm{.}10\mathrm{.}0\mathrm{.}1$

$191\mathrm{.}10\mathrm{.}0\mathrm{.}1$