Which of the following would be a viable way to earn abnormally high trading profits if markets are semistrong-form efficient? a. Buy shares in companies with low P/E ratios. b. Buy shares in...

Which of the following would be a viable way to earn abnormally high trading profits if markets are semistrong-form efficient?
a. Buy shares in companies with low P/E ratios.
b. Buy shares in companies with recent above-average price changes.
c. Buy shares in companies with recent below-average price changes.
d. Buy shares in companies for which you have advance knowledge of an improvement in the management team.