Classify the following matrices:

$\text{ (i) }\left[\begin{array}{cc}2& -1\\ 5& 1\end{array}\right]$

$\text{ (ii) }\left[\begin{array}{lll}2& 3& -7\end{array}\right]$

$\text{ (iii) }\left[\begin{array}{c}3\\ 0\\ -1\end{array}\right]$

$\text{ (iv) }\left[\begin{array}{cc}2& -4\\ 0& 0\\ 1& 7\end{array}\right]$

$\text{ (v) }\left[\begin{array}{rrr}2& 7& 8\\ -1& \sqrt{2}& 0\end{array}\right]$

$\text{ (vi) }\left[\begin{array}{lll}0& 0& 0\\ 0& 0& 0\end{array}\right]$

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