a) \(\left[ \begin{array}{c c r } 0 & 1 & 2 \end{array}\right]\)
b) \(\left[ \begin{array}{c c r r} 0\\ 1 \\ 2\end{array}\right]\)
c) \(\left[ \begin{array}{c r} 0 & 1\\ 1 & 2\end{array}\right]\)
d) \(\left[ \begin{array}{c c r r} 0 & 3 & 6 \\ 1 & 8 & 4 \\ 0 & 5 & 7\end{array}\right]\)

Answer: a
Explanation: A matrix of (1 x n) dimension is called row vector. A matrix of (n x1) dimension is called column vector.
For example
d=[ 1 2 3 4] is a row vector.
c = \(\left[ \begin{array}{c c r r} 0\\ 1 \\ 2\end{array}\right]\) is a column vector.