$A=\left[\begin{array}{ll}2 & 0 \\5 & 6\end{array}\right]$ এবং $B=\left[\begin{array}{cc}-2 & 0 \\-5 & -6\end{array}\right]$ হলে $A+B=$ কত ?

$\left[\begin{array}{ll}0 & 0 \\5 & 6\end{array}\right]$

$\left[\begin{array}{ll}2 & 0 \\0 & 0\end{array}\right]$

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

$\left[\begin{array}{cc}-4 & 0 \\-40 & -36\end{array}\right]$