Perform the Matrix Operation $A = \left[ \begin{array} { r r } - 1 & 3 \\ 3 & 2 \end{array} \right]$

Multiple Choice

Perform the matrix operation.
-Given $A = \left[ \begin{array} { r r } - 1 & 3 \\ 3 & 2 \end{array} \right]$ and $B = \left[ \begin{array} { l l } - 2 & 0 \\ - 1 & 2 \end{array} \right]$ , find $A B$ .

A)
$\left[ \begin{array} { l l } 6 & - 1 \\ 4 & - 8 \end{array} \right]$
B)
$\left[ \begin{array} { l l } - 1 & 6 \\ - 8 & 4 \end{array} \right]$
C)
$\left[ \begin{array} { r r } 2 & - 6 \\ - 2 & 1 \end{array} \right]$
D)
$\left[ \begin{array} { r r } 2 & 0 \\ - 3 & 4 \end{array} \right]$