Which Scenario would Record to two Conversions (1-per-click)?

1. A user clicks on an ad, converts, and returns to the site using a bookmark within 30 days and converts again.
2. A user clicks on an ad and converts. The user performs the search again the following day, clicks on the same ad and converts again. 
3. A user clicks on an ad and does not convert. The user performs the search again the following day, clicks on the same ad and converts. 
4. A user clicks on an ad, does not convert, then returns to the site using a bookmark within 30 days and converts.