Use the Matrix Capabilities of a Graphing Utility to Find

Use the matrix capabilities of a graphing utility to find AB, if possible. $A = \left[ \begin{array} { c c c } - 5 & 1 & - 9 \\5 & 5 & 7 \\9 & 5 & 1\end{array} \right] , B = \left[ \begin{array} { c c c } 7 & 2 & - 9 \\- 1 & - 7 & - 7 \\1 & - 7 & 7\end{array} \right]$

A) $\left[ \begin{array} { c c c } - 35 & 2 & 81 \\- 5 & - 35 & - 49 \\9 & - 35 & 7\end{array} \right]$
B) $\left[ \begin{array} { c c c } - 27 & - 80 & 101 \\23 & 24 & - 129 \\57 & - 10 & - 123\end{array} \right]$
C) $\left[ \begin{array} { c c c } - 45 & 37 & 59 \\46 & - 74 & - 24 \\- 25 & - 31 & - 109\end{array} \right]$
D) $\left[ \begin{array} { c c c } - 45 & 46 & - 25 \\37 & - 74 & - 31 \\59 & - 24 & - 109\end{array} \right]$
E) not possible