A team disables optional direct S3 access and worries that this necessarily disabled the built-in managed-backup network integration. Which statement is correct?

1. The managed-backup S3 network integration is distinct from optional direct S3 access.
2. Both options always share a single customer-controlled enable switch.
3. Disabling optional S3 access deletes all existing managed backups.
4. S3 is reachable only through the application's NAT gateway.