Find the Product, AB, If Possible A) $\left[ \begin{array} { r r r } 6 & - 3 & 6 \\ 1 & 2 & - 1 \end{array} \right]$

Multiple Choice

Find the product, AB, if possible.
- $$A = \left[ \begin{array} { l l } 1 & 0 \\0 & 3\end{array} \right] , B = \left[ \begin{array} { r r r } 1 & 2 & - 1 \\2 & - 1 & 2\end{array} \right]$$

A) $\left[ \begin{array} { r r r } 6 & - 3 & 6 \\ 1 & 2 & - 1 \end{array} \right]$

B) $\left[ \begin{array} { r r r } 1 & 2 & - 1 \\ 6 & - 3 & 6 \end{array} \right]$

C) $\left[ \begin{array} { r r r } 1 & 0 & 0 \\ 0 & - 3 & 6 \end{array} \right]$

D) $\mathrm { AB }$ is not defined.