Find the Indicated Matrix Product or State That the Product

Multiple Choice

Find the indicated matrix product or state that the product is undefined.
- $$A = \left[ \begin{array} { r r } 1 & 2 \\- 4 & 8\end{array} \right] , B = \left[ \begin{array} { r r r } - 7 & - 4 & - 7 \\1 & 6 & - 6\end{array} \right]$$
BA

A)
$\left[\begin{array}{rrr}-5 & 8 & -19 \\36 & 64 & -20\end{array}\right]$
B)
$\left[\begin{array}{rrr}-7 & -4 & -14 \\-4 & 6 & -48\end{array}\right]$
C)
$\left[\begin{array}{cc}-7 & -8 \\-4 & 48\end{array}\right]$
D) Undefined