Question: What is the Output decorator used for in this component class?

1. It makes the `itemTotalChanged` class field public.
2. It provides a way to bind values to the `itemTotalChanged` class field, like so: ``.
3. It provides a way to bind events to the `itemTotalChanged` class field, like so: ``.
4. It is simply a way to put a comment in front of a class field for documentation.

Answer: The correct answer of the above question is Option C:It provides a way to bind events to the `itemTotalChanged` class field, like so: ``.