What is the image of the point (3,1)(3, 1)(3,1) after a 180∘180^\circ180∘ rotation about the point (1,1)(1, 1)(1,1)?
(−1,1)(-1, 1)(−1,1)
(1,−1)(1, -1)(1,−1)
(1,1)(1, 1)(1,1)
(−1,−1)(-1, -1)(−1,−1)