If $A = \begin{bmatrix} 1 & 0 \\ 0 & 1 \end{bmatrix}$ and $B = \begin{bmatrix} 4 & 0 \\ 1 & -2 \\ 0 & 3 \end{bmatrix}$,then $AB =$ . . . . . . .
- A$\begin{bmatrix} 4 & 0 \\ 1 & -2 \\ 0 & 3 \end{bmatrix}$
- B$\begin{bmatrix} 1 & 0 \\ 0 & 1 \end{bmatrix}$
- C$\begin{bmatrix} 4 & 0 \\ 1 & -2 \end{bmatrix}$
- DDoes not exist
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