已知曲线y=2+x2y = 2 + x^2y=2+x2,则该曲线的拐点是( ).
(A)(0,2)(0,2)(0,2)
(B)(1,3)(1,3)(1,3)
(C)(0,0)(0,0)(0,0)
(D)(−1,1)(-1,1)(−1,1)
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