8. (3 points) . Determine which of the following conditions is NOT NECESSARY in order for a function y = f(x) to be differentiable at x =a. Circle all conditions which are not necessary. (A) lim f(ath)- f(a) = lim f(ath) - f(a) (B) lim f(x) - f(a) fa) 1-0 h h x- a (C) lim f(x) = f(a) (D) lim f(x) - f(a) = lim f(x) (E) lim f(x) - f(a) exists x- a x- a