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If f(x) is a ploynomial function satisfy...

If f(x) is a ploynomial function satisfying `f(x) . f(1/x) = f(x) + f(1/x)` and f(3)=28, then f(2) is

A

1(1/sqrt5, 2/sqrt5,0)`

B

(1,2,0)

C

(0,1,-1)

D

`(1/sqrt5, 2/sqrt5, 1/sqrt5)`

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The correct Answer is:
A
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