3. The (entire) graph of a semi-discrete (piecewise defined ) function y = f (a ) is illustrated below. O-O 4 2 yed -6 -4 -2 -4 Oats Reser OO What is the domain Df and the range Rf of this function? (A) The concepts of range and domain are not applicable in this case (B) Df = [-6, 6], Rf = {0} (C) Df = (-6, 6), Rf = {-6, 0, +6} (D) Df = (-6, 6), Rf = Df (E) Df = (-6, -4) U (24, -2) 0 (-2, 0) U (0, 2) U (2, 4) U (4, 6), Rf = {-6, 0, +6}4. Let f(ac) = 1 ac - 1 and g(a) = vac, then the values of ac that must be excluded from to make the domain of (f/ g) (a) (the 'quotient' of f and g) are represented on the real number line by? (Note: this question is not asking for the domain!) (A) -1 0 1 2 . . . . . . . . . ....." (B) -1 0 1 2 (C) -1 0 2 ...... O (D) -1 0 2 O . .. . (E) -10) 0 1 2