For x2−5y2=4x^2 - 5y^2 = 4x2−5y2=4, which of the following is a valid integer solution?
(3,1)(3, 1)(3,1)
(1,1)(1, 1)(1,1)
(4,2)(4, 2)(4,2)
(2,0)(2, 0)(2,0)