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) = square root (x+a) -b
b) f(x) = cube root x+a -b
c) f(x) = cube root x-b +a
d) f(x) = square toot x-a +b
Note: the last letters a and b in the answers are not included in the root