C-05-Q073mediumsingle_mcqThe solutions of x2+xy+y2=3, x2−xy+y2=7x^2 + xy + y^2 = 3,\ x^2 - xy + y^2 = 7x2+xy+y2=3, x2−xy+y2=7 include —a(2,−1), (−2,1), (1,−2), (−1,2)(2, -1),\ (-2, 1),\ (1, -2),\ (-1, 2)(2,−1), (−2,1), (1,−2), (−1,2)b(2,1), (1,2)(2, 1),\ (1, 2)(2,1), (1,2)c(3,−2), (−3,2)(3, -2),\ (-3, 2)(3,−2), (−3,2)d(0,0)(0, 0)(0,0)