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Given that f: S to R is said to have a ...

Given that `f: S to R ` is said to have a fixed point at c of S if f(c ) = c .
Let `f:[1,oo) toR` be defined by `f(x)=1+sqrt(x)`. Then

A

f has no fixed point in `[1,oo)`

B

f has unique fixed point in `[1,oo)`

C

f has two fixed point in `[1,oo)`

D

f has infinitely many fixed points in `[1, oo)`

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