Classify the following matrices :

$\text{(i) }\begin{bmatrix$}[r] 2 & -1 \ 5 & 1 \end{bmatrix} \\[0.5em]

$\text{(ii) } \begin{bmatrix} 2 & 3 & -7 \end{bmatrix} \\[0.5em]$

$\text{(iii) } \begin{bmatrix$}[r] 3 \ 0 \ -1 \end{bmatrix} \\[0.5em]

$\text{(iv) } \begin{bmatrix} 2 & -4 \ 0 & 0 \ 1 & 7 \end{bmatrix} \\[0.5em]$

$\text{(v) } \begin{bmatrix$}[r] 2 & 7 & 8 \ -1 & \sqrt{2} & 0 \end{bmatrix} \\[0.5em]

$\text{(vi) } \begin{bmatrix} 0 & 0 & 0 \ 0 & 0 & 0 \end{bmatrix}. \\[0.5em]$

(i) It is a square matrix of order 2.

(ii) It is a row matrix of order 1 x 3.

(iii) It is a column matrix of order 3 x 1.

(iv) It is a 3 x 2 matrix.

(v) It is a 2 x 3 matrix.

(vi) It is a zero matrix of order 2 x 3.