Find the Product AB, If Possible $A=\left[\begin{array}{rrr}-2 & 7 & -7 \\ 5 & 9 & -5\end{array}\right], B=\left[\begin{array}{r}7 \\ -2 \\ -1\end{array}\right]$

Multiple Choice

Find the product AB, if possible.
- $A=\left[\begin{array}{rrr}-2 & 7 & -7 \\ 5 & 9 & -5\end{array}\right], B=\left[\begin{array}{r}7 \\ -2 \\ -1\end{array}\right]$

A) $\left[ \begin{array} { r } - 21 \\ 22 \end{array} \right]$

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

C) $\left[ \begin{array} { l l } - 21 & 22 \end{array} \right]$

D) $\left[ \begin{array} { r r r } - 2 & 7 & - 7 \\ 5 & 9 & - 5 \\ 7 & - 2 & - 1 \end{array} \right]$