Which pair (x,y)(x, y)(x,y) is a solution to the Pell equation x2−2y2=1x^2 - 2y^2 = 1x2−2y2=1?
(1,0)(1, 0)(1,0)
(2,1)(2, 1)(2,1)
(3,2)(3, 2)(3,2)
(2,2)(2, 2)(2,2)