Which one or ones of the following statements is/are true?

if the line x = 1 is a vertical asymptote of y = f(x), then f is not defined at x = 1.
if f(2) > 0 and f(4) < 0, then there exists a number c between 2 and 4 such that f(c) = 0.
if f is continuous at x = 5 and f(5) = 2 and f(4) = 3, then the limit as x approaches 2 of the quantity 4 times x squared minus 11 equals 2.
a. i only

b. ii only

c. iii only

d. all statements are true.