A rotation of 90∘90^{\circ}90∘ clockwise about the origin maps (x,y)(x, y)(x,y) to which point?
(y,−x)(y, -x)(y,−x)
(−y,x)(-y, x)(−y,x)
(x,−y)(x, -y)(x,−y)
(−x,y)(-x, y)(−x,y)