1
$\left\{ X\in \mathbb{R}\left| X\le -۱ \right. \right\}$
✓
✗
2
$\left\{ X\in \mathbb{R}\left| -۱\le X \right. \right\}$
✓
✗
3
$\left\{ X\in \mathbb{R}\left| X\lt -۱ \right. \right\}$
✓
✗
4
$\left\{ X\in \mathbb{R}\left| X\gt -۱ \right. \right\}$
✓
✗