Find the Product AB, If Possible A) $\left[ \begin{array} { l } 57 \\ 40 \end{array} \right]$

Multiple Choice

Find the product AB, if possible.
- $A = \left[ \begin{array} { l l l } - 9 & - 4 & - 4 \\ - 4 & - 9 & - 1 \end{array} \right] , B = \left[ \begin{array} { l } - 1 \\ - 3 \\ - 9 \end{array} \right]$

A)
$\left[ \begin{array} { l } 57 \\ 40 \end{array} \right]$
B) $\mathrm { AB }$ is not defined.
C) $\left[ \begin{array} { l l } 57 & 40 \end{array} \right]$
D)

$\left[ \begin{array} { c c c } - 9 & - 4 & - 4 \\ - 4 & - 9 & - 1 \\ - 1 & - 3 & - 9 \end{array} \right]$