If A=(2134)A = \begin{pmatrix} 2 & 1 \\ 3 & 4 \end{pmatrix}A=(2314) and k=0k = 0k=0, what is kAkAkA?
(2134)\begin{pmatrix} 2 & 1 \\ 3 & 4 \end{pmatrix}(2314)
(0000)\begin{pmatrix} 0 & 0 \\ 0 & 0 \end{pmatrix}(0000)
(0130)\begin{pmatrix} 0 & 1 \\ 3 & 0 \end{pmatrix}(0310)
Undefined