যদি $A=\left[\begin{array}{ll}1 & 0 \\0 & 5\end{array}\right], B=\left[\begin{array}{ll}5 & 0 \\0 & 1\end{array}\right]$ হয় , তবে $\mathrm{AB}$ হলো।

$\left[\begin{array}{ll}5 & 0 \\0 & 5\end{array}\right]$

$\left[\begin{array}{cc}5 & 0 \\10 & 5\end{array}\right]$

$\left[\begin{array}{cc}10 & 0 \\0 & 5\end{array}\right]$

$\left[\begin{array}{cc}0 & 5 \\5 & 10\end{array}\right]$