MCQ
If $A=\left[\begin{array}{rr}2 & 1 \\ -1 & 2\end{array}\right], B=\left[\begin{array}{rr}1 & -2 \\ 2 & 1\end{array}\right], C=\left[\begin{array}{rr}1 & -3 \\ 2 & 1\end{array}\right]$,then
- ✓$\text{A+B=B+A}$ and $\text{A+(B+C)=(A+B)+C}$
- B$\text{A+B=B+A}$ and $\text{AC=BC}$
- C$\text{A+B=B+A}$ and $\text{AB=BC}$
- D$\text{AC=BC}$ and $\text{A=BC}$
