For this task, I chose option 3.

There are many ways now to leave data. Maps is a very good example. With location services turned on on your phone, maps picks up on your regular parked places and can even identify places like ‘home’ and ‘work’. The recurring data (parked car) allows maps to anticipate where it is you might end up parking due to time and day and then route you there.

Cookies is another way we share data.