Which of the following is a statement of weak-form efficiency? I) If markets are efficient in the weak form, then it is

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Which of the following is a statement of weak-form efficiency?
I) If markets are efficient in the weak form, then it is impossible
to make consistently superior profits by using trading rules based
on past returns. II) If markets are efficient in the weak form,
then prices will adjust immediately to public information. III) If
markets are efficient in the weak form, then prices reflect all
information. IV) Analysts can easily forecast stock price
changes.
(a) I only (b) II only (c) II and III only (d) IV only