A service assistant should remember a user preference across future sessions, subject to consent and access controls. Which statement best describes agent memory for this purpose?

1. It means every interaction automatically retrains the foundation model for all customers.
2. It persists selected information outside the immediate request so it can be retrieved in later interactions; it does not necessarily update model weights.
3. It is identical to the maximum output-token limit for one answer.
4. It removes the need to decide which user may access the saved information.