Let A=(1021)A = \begin{pmatrix} 1 & 0 \\ 2 & 1 \end{pmatrix}A=(1201). What is A2A^2A2?
(1041)\begin{pmatrix} 1 & 0 \\ 4 & 1 \end{pmatrix}(1401)
(1021)\begin{pmatrix} 1 & 0 \\ 2 & 1 \end{pmatrix}(1201)
(1044)\begin{pmatrix} 1 & 0 \\ 4 & 4 \end{pmatrix}(1404)
(1001)\begin{pmatrix} 1 & 0 \\ 0 & 1 \end{pmatrix}(1001)