The domain of f(x) is the set of all real values except 7, and the domain of g(x) is the set of all real values except -3. Which of the following describes the domain of (g•f)(x)?
all real values except x-3 and the x for which fx) - 7
all real values except x-3 and the x for which f(x)-3
all real values except x - 7 and the x for which f(x) - 7
all real values except x7 and the x for which f(x) -3