Alex Khan has developed a trading strategy where he buys firms with a relatively low forward Price/Earnings ratio (uses current stock price relative to expected earnings) to benefit from relatively cheap stock prices. This trading rule has consistently earned a risk-adjusted return of 15% per month for the past 10 years. This is violation of: (select the most correct choice) 1. weak-form market efficiency 2. semi-strong form market efficiency 3. strong form market efficiency O a. 1 only O b. 2 only C. 3 only O d. Both 2 and 3 e. Both 1 and 2