A financial application produces reports averaging 50 KB each and stores them in Amazon S3. Reports are frequently accessed during the first week after production and must be retained for several years. Reports must be retrievable within 6 hours. Which solution is the MOST cost-effective?

The correct solution leverages S3 Standard for frequent initial access and then transitions to S3 Glacier for cost-effective long-term storage. S3 Glacier offers the lowest storage cost for data that is infrequently accessed but requires retrieval within hours (standard retrieval for Glacier is 3-5 hours, meeting the 6-hour requirement). Incorrect options: Transitioning to S3 Standard-IA is less cost-effective than S3 Glacier for data accessed very infrequently over several years, especially given the 50 KB object size which incurs higher per-object charges in S3-IA. S3 Intelligent-Tiering is designed for unknown or changing access patterns, adding overhead that isn't necessary here since the access pattern is well-defined. S3 Glacier Deep Archive has significantly lower retrieval costs but slower retrieval times (12 hours or more), which does not meet the 6-hour retrieval requirement.