If A=(1001)A = \begin{pmatrix} 1 & 0 \\ 0 & 1 \end{pmatrix}A=(1001) and k=5k = 5k=5, what is kAkAkA?
(1001)\begin{pmatrix} 1 & 0 \\ 0 & 1 \end{pmatrix}(1001)
(5001)\begin{pmatrix} 5 & 0 \\ 0 & 1 \end{pmatrix}(5001)
(5005)\begin{pmatrix} 5 & 0 \\ 0 & 5 \end{pmatrix}(5005)
(6006)\begin{pmatrix} 6 & 0 \\ 0 & 6 \end{pmatrix}(6006)