Given the Matrices $A$ And $B$ , Find the Matrix Product $A B$

Multiple Choice

Given the matrices $A$ and $B$ , find the matrix product $A B$ .
- $\mathrm{A}=\left[\begin{array}{rrr}7 & 3 & 6 \\ -6 & -4 & 1 \\ -1 & 3 & 8\end{array}\right], \mathrm{B}=\left[\begin{array}{rrr}-4 & 6 & 4 \\ 2 & -7 & -6 \\ -8 & -9 & -5\end{array}\right]$ . Find $\mathrm{AB}$ .

A) $\left[\begin{array}{rrr}-28 & 18 & 24 \\ -12 & 28 & -6 \\ 8 & -27 & -40\end{array}\right]$
B) $$\left[\begin{array}{rrr}-70 & -33 & -20 \\8 & -17 & -5 \\-54 & -99 & -62\end{array}\right]$$
C) $$\left[\begin{array}{lrl}-70 & 8 & -54 \\-33 & -17 & -99 \\-20 & -5 & -62\end{array}\right]$$
D) $$\left[\begin{array}{rrr}7 & 3 & 6 \\-6 & -4 & 1 \\-1 & 3 & 8 \\-4 & 6 & 4 \\2 & -7 & -6 \\-8 & -9 & -5\end{array}\right]$$