A support team compares two applications: one assigns a ticket to a fixed category, and another drafts a new response tailored to the ticket. Which statement best distinguishes the second application?

1. It must be reinforcement learning because a customer might later rate the response.
2. It performs only regression because every response can be counted in characters.
3. It uses generative AI to create new response content rather than only selecting a predefined label.
4. It is necessarily unsupervised clustering because the response contains multiple sentences.