If A=(23)A = \begin{pmatrix} 2 \\ 3 \end{pmatrix}A=(23) and B=(45)B = \begin{pmatrix} 4 & 5 \end{pmatrix}B=(45), what is ABABAB?
(8101215)\begin{pmatrix} 8 & 10 \\ 12 & 15 \end{pmatrix}(8121015)
(815)\begin{pmatrix} 8 \\ 15 \end{pmatrix}(815)
38
Undefined