which of the following statements are true. (multiple statements can be true)

1. The phenomenon of time series reversal always causes interruptions to the momentum-type investors

2. The phenomenon of time series reversal benefits the investor who uses the opposite signals of popular strategies

3. A contrarian investor only invests in SELL-Signals of a momentum strategy

4. A contrarian investor opens BUY (Long) positions when other investors open SELL (Short) positions.

5. A contrarian investor always opens short positions when other strategies open a long position