Question
Out of the given matrices, choose that matrix which is a scalar matrix:
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$\begin{bmatrix}0&0\\0&0\end{bmatrix}$
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$\begin{bmatrix}0&0&0\\0&0&0\end{bmatrix}$
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$\begin{bmatrix}0&0\\0&0\\0&0\end{bmatrix}$
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$\begin{bmatrix}0\\0\\0\end{bmatrix}$