Which of the following would allow a stock analyst to earn an abnormal return if the market is semi-strong form efficient?

(Just select a, b, c, or d for the two scenarios above; however, there may be more than 1 answer for each scenarios)

1. The stock price has risen steadily each day for the past 30 days.
2. The financial statements for a company were released three days ago, and you believe youve uncovered some anomalies in the companys inventory and cost control reporting techniques that are understating the firms true liquidity strength.
3. You observe that the senior management of a company has been buying a lot of the companys stock on the open market over the past week.
4. Your next-door neighbor, who happens to be a computer analyst at the local steel plant, casually mentions that a German steel conglomerate hinted yesterday that it might try to acquire the local firm in a hostile takeover.