A company introduces an internal API that was never public. A developer wants Copilot to use it correctly. Which two inputs are most useful? Select 2 answers.

1. An unrelated public API name that sounds similar.
2. A statement that the API is popular, without describing it.
3. The relevant API signatures and current internal documentation that the developer is authorized to share.
4. A requirement that the model infer the private API without any context.
5. A small, representative usage example with expected behavior.