Which of the following Observations would appear to violate the weak form of EMH? Semi strong from? Strong form? Please explain

1. The average rate of return is significantly greater than zero.

2. The correlation between the market return one week and the return the following week is zero.

3. You could have consistently made superior returns by buying stock after a 10% rise in price and selling after a 10% fall.

4. You could have consistently made superior returns by forecasting future earnings performance with your new Crystal Ball forecast methodology