1. $A=\left[3 4\right]$

• A. $\left[\begin{array}{c}3 -6 0\\ 12 15 -9\end{array}\right]$
• B. $\left[\begin{array}{c}3 -6 0\\ 12 15 -9\end{array}\right]$
• C. $\left[\begin{array}{c}3 -6 0\\ 12 15 -9\end{array}\right]$
• D. $\left[\begin{array}{c}3 -6 0\\ 12 15 -9\end{array}\right]$

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