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Let f be arry continuously differentiabl...

Let `f` be arry continuously differentiable function on `[a,b]` and twice differentiable on `(a.b)` such that `f(a)=f(a)=0 and f(b)=0.` Then

A

`f''(a) =0`

B

`f '(x) =0` for some `x in (a,b)`

C

`f''(x)=0` for some ` x in (a,b)`

D

`f'''(x) =0` for some `x in (a,b)`

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The correct Answer is:
B, C
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