ضابطهٔ وارون تابع $y=\left\{ \begin{matrix}
{{x}^{2}}+1\,\,\,\,\,\,\,\,x\le 0  \\
1-x\,\,\,\,\,\,\,\,\,\,\,\,\,x>0  \\
\end{matrix} \right.$ کدام است؟
1 )
$y=\left\{ \begin{matrix}
-\sqrt{x-1}\,\,\,\,\,\,\,\,\,\,x\ge 0  \\
1-x\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,x\lt 0  \\
\end{matrix} \right.$
2 )
$y=\left\{ \begin{matrix}
\sqrt{x-1}\,\,\,\,\,\,\,\,x\ge 0\text{ }~\text{ }  \\
x+1\,\,\,\,\,\,\,\,x\lt 0  \\
\end{matrix} \right.$
3 )
$y=\left\{ \begin{matrix}
\sqrt{x-1}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,x\ge 1  \\
x+1\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,x\lt 1  \\
\end{matrix} \right.$
$y=\left\{ \begin{matrix}
-\sqrt{x-1}\,\,\,\,\,x\ge 1  \\
1-x\,\,\,\,\,\,\,\,\,\,\,x\lt 1  \\
\end{matrix} \right.$