Write the Augmented Matrix for the System $\begin{array} { r } 7 x + 3 z - 2 = 0 \\2 y + 6 z - 20 = 0 \\3 x + 9 y + 2 z - 12 = 0\end{array}$

Multiple Choice

Write the augmented matrix for the system. Do not solve the system.
$\begin{array} { r } 7 x + 3 z - 2 = 0 \\2 y + 6 z - 20 = 0 \\3 x + 9 y + 2 z - 12 = 0\end{array}$

A) $\left[ \begin{array} { r r r | r } 7 & 0 & 3 & 2 \\0 & 2 & 9 & 20 \\3 & 6 & 2 & 12\end{array} \right]$
B) $\left[ \begin{array} { l l l } 7 & 0 & 3 \\0 & 2 & 6 \\3 & 9 & 2\end{array} \right]$
C) $\left[ \begin{array} { r r r | r } 7 & 3 & 0 & 2 \\2 & 6 & 0 & 20 \\3 & 9 & 2 & 12\end{array} \right]$
D) $\left[ \begin{array} { c c c | c } 7 & 0 & 3 & 2 \\0 & 2 & 6 & 20 \\3 & 9 & 2 & 12\end{array} \right]$