Which of these is a solution to the Pell equation x2−3y2=1x^2 - 3y^2 = 1x2−3y2=1?
(1,0)(1, 0)(1,0)
(2,1)(2, 1)(2,1)
(3,2)(3, 2)(3,2)
(4,1)(4, 1)(4,1)