Let f(x) be a derivable function f'(x)gt...

Let f(x) be a derivable function `f'(x)gtf(x)" and " f(0)=0`. Then

A

`f(x)gt0" for all "x gt0`

B

`f(x)lt0" for all "x gt0`

C

no sign of `f(x)` can be ascertained

D

`f(x)` is a constant function

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A

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