$P+Q=\left[\begin{array}{ll}1 & 2 \\3 & 4\end{array}\right]$ এবং $\mathbf{P}-\mathbf{Q}=\left[\begin{array}{ll}5 & 6 \\7 & 8\end{array}\right]$ হলে P = ?

$\left[\begin{array}{ll}-4 & -3 \\-6 & -5\end{array}\right]$

$\left[\begin{array}{ll}3 & 4 \\5 & 6\end{array}\right]$

$\left[\begin{array}{cc}1 & -2 \\5 & 6\end{array}\right]$

$\left[\begin{array}{ll}5 & -6 \\5 & -8\end{array}\right]$