What is the result of rotating a point (x,y)(x, y)(x,y) about the origin 180∘180^{\circ}180∘?
(y,x)(y, x)(y,x)
(−x,y)(-x, y)(−x,y)
(−x,−y)(-x, -y)(−x,−y)
(x,−y)(x, -y)(x,−y)