Find the Indicated Sum or Difference, If It Is Defined $$\left[ \begin{array} { l l } 5 & 4\end{array} \right] + \left[ \begin{array} { r } - 1 \\5\end{array} \right]$$

Multiple Choice

Find the indicated sum or difference, if it is defined.
- $$\left[ \begin{array} { l l } 5 & 4\end{array} \right] + \left[ \begin{array} { r } - 1 \\5\end{array} \right]$$

A) $\left[ \begin{array} { l l } 4 & 9 \end{array} \right]$
B) not defined
C) $\left[ \begin{array} { l } 4 \\ 9 \end{array} \right]$
D) $\left[ \begin{array} { r r } 5 & - 1 \\ 4 & 5 \end{array} \right]$