Which of the following are valid ways to express the reserved Loopback Address in IPv$6?($choose two$)$

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

::$1$

FF$-$FF$-$FF$-$FF$-$FF$-$FF

$0$:$0$:$0$:$0$:$0$:$0$:$0$:$1$

$255\mathrm{.}255\mathrm{.}255\mathrm{.}255$