Which matrix represents a rotation of 90∘90^\circ90∘ clockwise about the origin?
(01−10)\begin{pmatrix} 0 & 1 \\ -1 & 0 \end{pmatrix}(0−110)
(0−110)\begin{pmatrix} 0 & -1 \\ 1 & 0 \end{pmatrix}(01−10)
(100−1)\begin{pmatrix} 1 & 0 \\ 0 & -1 \end{pmatrix}(100−1)
(−1001)\begin{pmatrix} -1 & 0 \\ 0 & 1 \end{pmatrix}(−1001)