Find the adjoint of the matrix: $\begin{bmatrix} 1&2 \\ 3&4 \end{bmatrix} $

Question

$\begin{array}{1 1} \begin{bmatrix}4 & -2\\-3& 1\end{bmatrix} \\ \begin{bmatrix}4 & 2\\-3& 1\end{bmatrix} \\ \begin{bmatrix}4 & -2\\3& 1\end{bmatrix} \\ \begin{bmatrix}4 & -2\\-3& -1\end{bmatrix}\end{array} $