Which address notation is the IPv$6$ loopback address?

Group of answer choices

FEDC::$00$CF:$1234$

$0127\mathrm{.}0000\mathrm{.}0000\mathrm{.}0001\mathrm{.}0127\mathrm{.}0000\mathrm{.}0000\mathrm{.}0001$

$0000$:$0000$:$0000$:$0000$:$0000$:$0000$:$0000$:$0001$

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