$A=\left[\begin{array}{ll}1 & 2 \\3 & 4\end{array}\right]$ হলে $A^{-1}=$কত ?

$-\frac{1}{2}\left[\begin{array}{ll}4 & 3 \\2 & 1\end{array}\right]$

$-\frac{1}{2}\left[\begin{array}{cc}4 & -3 \\-2 & 1\end{array}\right]$

$-\frac{1}{2}\left[\begin{array}{cc}-4 & -2 \\-3 & 1\end{array}\right]$

$-\frac{1}{4}\left[\begin{array}{cc}4 & -3 \\-2 & 1\end{array}\right]$