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[" 49.Let "R rarr R" be twice continuous...

[" 49.Let "R rarr R" be twice continuously differentialle (or "f''" exists and is continuts such "],[" that "f(0)=f(1)=f'(0)=0" .Then "],[[(A)f''(c)=0" for somec "in R," (B) there is no point for which "f''(x)=0],[" (C) at all points "f''(x)>0," (D) atall points "f'']]

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