If A=(1203)A = \begin{pmatrix} 1 & 2 \\ 0 & 3 \end{pmatrix}A=(1023), what is the matrix ATAA^T AATA?
(12213)\begin{pmatrix} 1 & 2 \\ 2 & 13 \end{pmatrix}(12213)
(1023)\begin{pmatrix} 1 & 0 \\ 2 & 3 \end{pmatrix}(1203)
(1225)\begin{pmatrix} 1 & 2 \\ 2 & 5 \end{pmatrix}(1225)
(1009)\begin{pmatrix} 1 & 0 \\ 0 & 9 \end{pmatrix}(1009)