Which one or ones of the following statements is/are true? if the line y = 2 is a horizontal asymptote of y = f(x), then f is not defined at y = 2. if f(1) > 0 and f(3) < 0, then there exists a number c between 1 and 3 such that f(c) = 0. if f is continuous at x = 6 and f(6) = 8 and f(4) = 2, then the limit as x approaches 2 of f of the quantity 4 times x squared minus 10 equals 8.