單項(xiàng)選擇題

設(shè)f(x)在(-∞,+∞)二階可導(dǎo),f′(x0)=0。問f(x)還要滿足以下哪個(gè)條件,則f(x0)必是f(x)的最大值()?

A.x=x0是f(x)的唯一駐點(diǎn)
B.x=x0是f(x)的極大值點(diǎn)
C.f″(x)在(-∞,+∞)恒為負(fù)值
D.f″(x0)≠0


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