Which description best explains the domain of (g circle f) (x)?
A) the elements in the domain of f(x) for which g(f(x)) is defined
B) the elements in the domain of f(x) for which g(f(x)) is not zero
C) the elements in the domain of g(x) for which g(f(x)) is defined
D) the elements in the domain of g(x) for which g(f(x)) is not zero