Which scenario would record to two conversions (1-per-click)?

Which scenario would record to two conversions (1-per-click)?

A) A users clicks on an ad, converts, and returns to the site using a bookmark within 30 days and converts again
B) A user clicks on an ad, does not convert, then returns to the site using a bookmark within 30 days and converts
C) 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
D) 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