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Let f(x) be a twice differentiable funct...

Let `f(x)` be a twice differentiable function for all real values of `x` and satisfies `f(1)=1,f(2)=4,f(3)=9.` Then which of the following is definitely true? (a).`f''(x)=2AAx` in (1,3) (b) `f''(x)= 5` for some x in (2,3) (c) `f''(x)=3AAx` in (2,3) (d) `f''(x)=2` for some x in (1,3)

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