A shear along the y-axis with factor k=3k=3k=3 is represented by which matrix?
(1031)\begin{pmatrix} 1 & 0 \\ 3 & 1 \end{pmatrix}(1301)
(1301)\begin{pmatrix} 1 & 3 \\ 0 & 1 \end{pmatrix}(1031)
(3001)\begin{pmatrix} 3 & 0 \\ 0 & 1 \end{pmatrix}(3001)
(1003)\begin{pmatrix} 1 & 0 \\ 0 & 3 \end{pmatrix}(1003)