Which of these is NOT an integer solution to x2−y2=8x^2 - y^2 = 8x2−y2=8?
(3,1)(3, 1)(3,1)
(−3,1)(-3, 1)(−3,1)
(3,−1)(3, -1)(3,−1)
(1,2)(1, 2)(1,2)