Question

Which of the following could be an example of a function with a domain (a,infinity) and a range (b,infinity) where a>0 and b>0
A: f(x)=sqrt(x+a-b)
B: f(x)=^3sqrt(x+a-b)
C: f(x)=^3sqrt(x-b) +a
D: f(x)=sqrt(x-a+b)