domain of this function? I don't know how to find it :[?

please answer and explain how to find the domain:
f(x)= sqrt(x-2) +3

if it helps, the choices are:
a) (-infinity, infinity), b) (2, infinity), c) [2, infinity) or d) [3, infinity)

please explain it thoroughly! I really need to learn this.
thanks a bunch :)
 
Back
Top