\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
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Which of the following matrices is a square matrix?
\(\mathbf{A}=\begin{pmatrix}1&5&9 \\0&3&7 \end{pmatrix}\)
\(\mathbf{B}=\begin{pmatrix}1 \\5 \end{pmatrix}\)
\(\mathbf{C}=\begin{pmatrix}1&5 \\0&3 \end{pmatrix}\)
\(\mathbf{D}=\begin{pmatrix}1&5&9 \end{pmatrix}\)
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