$2 A+B=\left[\begin{array}{rr}5 & 4 \\2 & -1\end{array}\right]$ এবং $A-B=\left[\begin{array}{rr}1 & -1 \\1 & 7\end{array}\right]$ হলে $A=$ কত?

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

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

$\left[\begin{array}{rr}1 & 2 \\0 & -5\end{array}\right]$

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