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Let `R` be the set of all real numbers `f:RrarrR` be given by `f(x)=3x^2+1`.Then the set `f^(-1) , (1,6)` is

A

`{-sqrt5/3,0,sqrt5/3}`

B

`{-sqrt5/3,sqrt5/3}`

C

`{-sqrt1/3,sqrt1/3}`

D

`(-sqrt5/3,sqrt5/3)`

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