Which matrix represents a 2×22 \times 22×2 Identity matrix?
(0110)\begin{pmatrix} 0 & 1 \\ 1 & 0 \end{pmatrix}(0110)
(1001)\begin{pmatrix} 1 & 0 \\ 0 & 1 \end{pmatrix}(1001)
(1111)\begin{pmatrix} 1 & 1 \\ 1 & 1 \end{pmatrix}(1111)
(1010)\begin{pmatrix} 1 & 0 \\ 1 & 0 \end{pmatrix}(1100)