Question: What is the `async` pipe doing in this example?

1. It is doing nothing, since the async pipe cannot be used in an `ngFor` statement.
2. It is configuring the `ngFor` iteration to support multiple lists of users at the same time.
3. It is subscribing to the observable returned from the `HttpClient.get` method and unwrapping the returned value so it can be iterated over in the `ngFor`.
4. It is allowing all of the users in the `users` field to be rendered concurrently to the DOM.

Answer: The correct answer of the above question is Option C:It is subscribing to the observable returned from the `HttpClient.get` method and unwrapping the returned value so it can be iterated over in the `ngFor`.