1. $A=\left(\begin{array}{ccc}1& 2& 3\\ 4& 5& 6\\ 7& 8& 9\end{array}\right)$

• A. $\left(\begin{array}{ccc}1& 3& 3\\ 6& 8& 6\\ 11& 13& 9\end{array}\right)$
• B. $\left(\begin{array}{ccc}1& 3& 3\\ 6& 8& 6\\ 11& 13& 9\end{array}\right)$
• C. $\left(\begin{array}{ccc}1& 3& 3\\ 6& 8& 6\\ 11& 13& 9\end{array}\right)$
• D. $\left(\begin{array}{ccc}1& 3& 3\\ 6& 8& 6\\ 11& 13& 9\end{array}\right)$

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