Compute AB, If Possible $A = \left[ \begin{array} { r r } 3 & - 2 \\ 3 & 0 \end{array} \right]$

Multiple Choice

Compute AB, if possible.
- $A = \left[ \begin{array} { r r } 3 & - 2 \\ 3 & 0 \end{array} \right]$ and $B = \left[ \begin{array} { r r } 0 & - 2 \\ 3 & 6 \end{array} \right]$

A) $\left[ \begin{array} { r r } - 6 & - 18 \\ 0 & - 6 \end{array} \right]$
B) $\left[ \begin{array} { r r } - 18 & - 6 \\ - 6 & 0 \end{array} \right]$
C) not possible
D) $\left[ \begin{array} { r r } - 6 & 0 \\ 27 & - 6 \end{array} \right]$