What is the transpose of a row vector (123)\begin{pmatrix} 1 & 2 & 3 \end{pmatrix}(123)?
(123)\begin{pmatrix} 1 \\ 2 \\ 3 \end{pmatrix}123
(321)\begin{pmatrix} 3 \\ 2 \\ 1 \end{pmatrix}321
(123)\begin{pmatrix} 1 & 2 & 3 \end{pmatrix}(123)
(321)\begin{pmatrix} 3 & 2 & 1 \end{pmatrix}(321)