A) $\left[ \begin{array} { l l } 72 & 53\end{array} \right]$

Multiple Choice

$A = \left[ \begin{array} { r } 3 \\- 2 \\6\end{array} \right] \text { and } B = \left[ \begin{array} { r r } 8 & 7 \\- 3 & - 1 \\7 & 5\end{array} \right]$

A) $\left[ \begin{array} { l l } 72 & 53\end{array} \right]$
B) not possible
C) $\left[ \begin{array} { l } 72 \\53\end{array} \right]$
D) $\left[ \begin{array} { r } 42 \\8 \\72\end{array} \right]$