Let f (x+y) =f (x) f (y) for all x and y...

Let `f (x+y) =f (x) f (y)` for all x and y, `and f(5)=2, f'(0)=3,` then `f '(5)` is equal to:

A

3

B

1

C

`-6`

D

6

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The correct Answer is:

C

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