Let f be a function such that f(x).f\'(-...

Let `f` be a function such that `f(x).f\'(-x)=f(-x).f\'(x)` for all `x` and `f(0)=3`.
Now answer the question:Number of roots of equation `f(x)=0` in interval `[-2,2]` is
(A) `0` (B) `2` (C) `4` (D) `1`

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