If A=(12)A = \begin{pmatrix} 1 & 2 \end{pmatrix}A=(12), what is 2AT2A^T2AT?
(24)\begin{pmatrix} 2 \\ 4 \end{pmatrix}(24)
(24)\begin{pmatrix} 2 & 4 \end{pmatrix}(24)
(12)\begin{pmatrix} 1 \\ 2 \end{pmatrix}(12)
(42)\begin{pmatrix} 4 \\ 2 \end{pmatrix}(42)