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

Multiple Choice

Given the matrices $A$ and $B$ , find the matrix product $A B$ .
- $\mathrm{A}=\left[\begin{array}{ll}1 & 0 \\ 0 & 3\end{array}\right], \mathrm{B}=\left[\begin{array}{rrr}5 & 2 & -1 \\ 2 & -1 & 2\end{array}\right]$ Find $\mathrm{AB}$ .

A) $\mathrm{AB}$ is not defined.
B) $\left[\begin{array}{lll}5 & 2 & -1 \\ 6 & -3 & 6\end{array}\right]$
C) $\left[\begin{array}{lll}6 & -3 & 6 \\ 5 & 2 & -1\end{array}\right]$
D) $\left[\begin{array}{lll}5 & 0 & 0 \\ 0 & -3 & 6\end{array}\right]$