Solve this following

$\left[\begin{array}{cc}72 & -63 \\ -84 & 51\end{array}\right]$

$\left[\begin{array}{cc}72 & -84 \\ -63 & 51\end{array}\right]$

$\left[\begin{array}{ll}51 & 63 \\ 84 & 72\end{array}\right]$

$\left[\begin{array}{ll}51 & 84 \\ 63 & 72\end{array}\right]$