Question: Based on the following usage of the async pipe, and assuming the users class field is an Observable, how many subscriptions to the users Observable are being made?

1. None. The async pipe does not subscribe automatically.
2. None. The template syntax is not correct.
3. Three. There is one for each async pipe.
4. One. The async pipe caches Observables by type internally.

Answer: The correct answer of the above question is Option C:Three. There is one for each async pipe.