Let A=(1101)A = \begin{pmatrix} 1 & 1 \\ 0 & 1 \end{pmatrix}A=(1011) and B=(0110)B = \begin{pmatrix} 0 & 1 \\ 1 & 0 \end{pmatrix}B=(0110). Which matrix equals AB−BAAB - BAAB−BA?
(0000)\begin{pmatrix} 0 & 0 \\ 0 & 0 \end{pmatrix}(0000)
(100−1)\begin{pmatrix} 1 & 0 \\ 0 & -1 \end{pmatrix}(100−1)
(1−110)\begin{pmatrix} 1 & -1 \\ 1 & 0 \end{pmatrix}(11−10)
(2111)\begin{pmatrix} 2 & 1 \\ 1 & 1 \end{pmatrix}(2111)