Which matrix represents a vertical shear by factor 4?
(1041)\begin{pmatrix} 1 & 0 \\ 4 & 1 \end{pmatrix}(1401)
(1401)\begin{pmatrix} 1 & 4 \\ 0 & 1 \end{pmatrix}(1041)
(4001)\begin{pmatrix} 4 & 0 \\ 0 & 1 \end{pmatrix}(4001)
(1004)\begin{pmatrix} 1 & 0 \\ 0 & 4 \end{pmatrix}(1004)