Find a + B A) $\left[ \begin{array} { r r } - 12 & - 7 \\ - 12 & - 6 \\ 1 & - 7 \end{array} \right]$

Multiple Choice

Find A + B.
- $A = \left[ \begin{array} { r r r } - 6 & - 9 & - 5 \\2 & - 1 & - 2\end{array} \right] , B = \left[ \begin{array} { r r } - 9 & - 6 \\- 5 & - 3 \\- 5 & 6\end{array} \right]$

A) $\left[ \begin{array} { r r } - 12 & - 7 \\ - 12 & - 6 \\ 1 & - 7 \end{array} \right]$
B) $\left[ \begin{array} { r r } - 15 & - 15 \\ - 3 & - 4 \end{array} \right]$
C) $\left[ \begin{array} { r r r } - 15 & - 15 & - 5 \\ - 3 & - 4 & - 2 \end{array} \right]$
D) Undefined