AWS Certified Data Engineer Associate DEA-C01 Practice Question

Storing the active 14 days of frequently accessed data in S3 Standard avoids per-request retrieval fees and provides the lowest latency for interactive queries. After 14 days, the data becomes cold but still needs occasional, milliseconds-latency access from Athena. Transitioning those objects to S3 Glacier Instant Retrieval provides the cheapest per-GB storage of the classes that Athena can query directly, while incurring only small retrieval fees during the rare quarterly analyses. Standard-IA costs significantly more than Glacier Instant Retrieval for infrequently accessed data, Intelligent-Tiering adds monthly monitoring charges and would keep some objects in more expensive tiers, and keeping everything in S3 Standard is the most expensive overall. Therefore, transitioning to S3 Glacier Instant Retrieval after 14 days is the most cost-effective option that still satisfies the access requirement.