Which transformation matrix results in the identity transformation?
(1001)\begin{pmatrix} 1 & 0 \\ 0 & 1 \end{pmatrix}(1001)
(−100−1)2\begin{pmatrix} -1 & 0 \\ 0 & -1 \end{pmatrix}^2(−100−1)2
(0110)2\begin{pmatrix} 0 & 1 \\ 1 & 0 \end{pmatrix}^2(0110)2
All of the above