\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
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Which of the following matrices is a column matrix?
\(\mathbf{A}=\begin{pmatrix}2&0&9 \end{pmatrix}\)
\(\mathbf{B}=\begin{pmatrix}7 \\ -1 \\ 4 \end{pmatrix}\)
\(\mathbf{C}=\begin{pmatrix}0&0 \\ 0&0 \end{pmatrix}\)
\(\mathbf{D}=\begin{pmatrix}2&8 \\ 6&1 \end{pmatrix}\)
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