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【单选题】
设f(x)在(-∞，+∞)内有定义，且x 0 ≠0是函数f(x)的极大值点，则（）。A.
x 0 必为f(x)的驻点
B.
-x 0 必为-f(x)的极小值点
C.
-x 0 必为-f(-x)的极小值点
D.
对任何x∈(-∞，+∞)，f(x)≤f(x 0 )
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