Let f: A rarr B be a function defined by...

Let `f: A rarr B` be a function defined by `f(x)=sqrt(x)` then which of the following is/are true? (where N,W,R are set of natural, whole, real numbers respectively)
a) `A=W, B=R`
b) `A=W, B=W`
c) `A=N, B=R`
d) `A=R, B=R`

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