Let the function f satisfies f(x).f ′ ...

Let the function f satisfies f(x).f ′ (−x)=f(−x).f ′ (x) for all x and f(0)=3 The value of `f(x).f(-x)` for all x is

A

4

B

9

C

12

D

16

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The correct Answer is:

B

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