What is the result of (12)+(34)\begin{pmatrix} 1 & 2 \end{pmatrix} + \begin{pmatrix} 3 & 4 \end{pmatrix}(12)+(34)?
(46)\begin{pmatrix} 4 & 6 \end{pmatrix}(46)
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(46)\begin{pmatrix} 4 \\ 6 \end{pmatrix}(46)
(38)\begin{pmatrix} 3 & 8 \end{pmatrix}(38)