Let A=(1101)A = \begin{pmatrix} 1 & 1 \\ 0 & 1 \end{pmatrix}A=(1011) and B=(2011)B = \begin{pmatrix} 2 & 0 \\ 1 & 1 \end{pmatrix}B=(2101). Compute ABABAB and BABABA. Which statement is true?
AB=BAAB = BAAB=BA
AB≠BAAB \neq BAAB=BA
AB=2BAAB = 2BAAB=2BA
AB+BA=IAB + BA = IAB+BA=I