If Possible, Find AB and State the Order of the Result

Multiple Choice

If possible, find AB and state the order of the result. $$A = \left[ \begin{array} { c c c } 5 & 0 & 0 \\0 & 4 & 0 \\0 & 0 & - 3\end{array} \right] , B = \left[ \begin{array} { c c c } 5 & 0 & 0 \\0 & - 5 & 0 \\0 & 0 & 4\end{array} \right]$$

A) $\left[ \begin{array} { c c c } 25 & 0 & 0 \\0 & - 20 & 0 \\0 & 0 & - 12\end{array} \right]$ Order: 3 × 3
B) $\left[ \begin{array} { c c c } 23 & 0 & 0 \\0 & - 20 & 0 \\0 & 0 & - 12\end{array} \right]$ Order: 3 × 3
C) $\left[ \begin{array} { c c c } 27 & 0 & 0 \\0 & - 20 & 0 \\0 & 0 & - 12\end{array} \right]$ Order: 3 × 3
D) $\left[ \begin{array} { c c c } 21 & 0 & 0 \\0 & - 20 & 0 \\0 & 0 & - 12\end{array} \right]$ Order: 3 × 3
E) $\left[ \begin{array} { c c c } 29 & 0 & 0 \\0 & - 20 & 0 \\0 & 0 & - 12\end{array} \right]$ Order: 3 × 3