Determine the Order of the Matrix $$\left[ \begin{array} { r } 2 \\- 1 \\2\end{array} \right]$$

Determine the order of the matrix.
- $$\left[ \begin{array} { r } 2 \\- 1 \\2\end{array} \right]$$

A) 3
B) $1 \times 3$
C) 1
D) $3 \times 1$