If you believe that you can make money by using technical analysis (i.e. using past stock price information to create trading rules), then you necessarily believe in which form of stock market efficiency? a. None, this precludes any of the three levels of stock market efficiency b. Weak form, since you can only use historical price information to predict future returns c. Semi-strong form, using historical price information is not related to public information's role of price efficiency d. Strong form, technical analysis does not tell us anything about market efficiency