17) Recall that a function is odd if f(-x) = -f(x) for all x E R. Assume that f (x) is odd and that lim f() = 4. Then a) lim f(x) = 4. r--2 b) lim f(x) = -4. c) we do not know anything about lim f(x). d) None of the above. 18) Assume that the function f(x) is odd. Assume also that lim f(x) = L. Then a) lim f(x) = L. b) lim f(x) = L if and only if L = 0. c) lim f(x) need not exist. d) None of the above