曲线y=x4−2x3+1y = x^4 - 2x^3 + 1y=x4−2x3+1的凸区间为( ).
(A)(−∞,0](-\infty,0](−∞,0]
(B)[0,1][0,1][0,1]
(C)[1,+∞)[1,+\infty)[1,+∞)
(D)(−∞,1](-\infty,1](−∞,1]
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