You should answer these questions without using a calculator.
60. Multiple Choice If f(x)=g(x) is an identity with domain of validity D, which of the following must be true?
I. For any x in D,f(x) is defined.
II. For any x in D,g(x) is defined.
III. For any x in D,f(x)=g(x).
(A) None
(B) I and II only
(C) I and III only
(D) III only
(E) I, II, and III
(A) None
(B) I and II only
(C) I and III only
(D) III only
(E) I, II, and III