A company must keep large audit objects for seven years. Access is extremely rare, and a retrieval wait of up to 48 hours is acceptable. The company already has separate controls for mandatory retention. Among the following storage classes, which best minimizes long-term storage cost for this access pattern?

1. S3 Standard-IA for all seven years.
2. S3 Standard for all seven years.
3. S3 Glacier Deep Archive with an appropriate restore procedure.
4. S3 Glacier Instant Retrieval for all seven years.