1 . A=3 4

• A. $\left[\begin{array}{c}3 -6 0\\ 12 15 -9\end{array}\right]$
• B. $\left[\begin{array}{c}4 -8 0\\ 16 20 -12\end{array}\right]$
• C. $\left[\begin{array}{c}19\\ 14\\ -12\end{array}\right]$
• D. $\left[\begin{array}{ccc}19& 14& -12\end{array}\right]$

Answer: Option D

Explanation: