$B=\left[\begin{array}{ll}2 & -7 \\1 & -4\end{array}\right]$ হলে $\mathbf{B}^{-1}$ কোনটি?

$\left[\begin{array}{ll}-4 & 7 \\-1 & 2\end{array}\right]$

$\left[\begin{array}{ll}4 & -7 \\1 & -2\end{array}\right]$

$\left[\begin{array}{ll}4 & -1 \\7 & -2\end{array}\right]$

$\left[\begin{array}{ll}2 & -1 \\7 & -4\end{array}\right]$