Which of the following statement is correct?

a.In an efficient market, one can predict stock prices by analyzing past stock price history.

b.Semi-strong form efficiency implies that one can beat the market based on fundamental analyses.

c.Market efficiency implies that investors might as well invest by throwing a dart at the Wall Street Journal's stock pages, and buying the stock that the dart hits.

d.If the market is efficient, security prices should be equal to the value of discounted future cash flows.

e.If market is efficient, the realized returns should be equal to the expected returns.