Find the Matrix Product, If Possible $$\left[ \begin{array} { r r } 3 & - 1 \\3 & 0\end{array} \right] \left[ \begin{array} { r r } 0 & - 1 \\4 & 6\end{array} \right]$$

Find the matrix product, if possible.
- $$\left[ \begin{array} { r r } 3 & - 1 \\3 & 0\end{array} \right] \left[ \begin{array} { r r } 0 & - 1 \\4 & 6\end{array} \right]$$

A)
$\left[ \begin{array} { r r } 0 & 1 \\ 12 & 0 \end{array} \right]$
B)
$\left[ \begin{array} { r r } - 3 & 0 \\ 30 & - 4 \end{array} \right]$
C)
$\left[ \begin{array} { r r } - 9 & - 4 \\ - 3 & 0 \end{array} \right]$
D)
$\left[ \begin{array} { r r } - 4 & - 9 \\ 0 & - 3 \end{array} \right]$