A mobile app feature lets users upload photos and videos at any time. The media is stored in an S3 bucket using S3 Standard and delivered through CloudFront. After 30 days, most objects are accessed infrequently, but some remain frequently accessed. The company requires millisecond retrieval for all objects at the lowest possible storage cost. Which solution meets these requirements?

S3 Intelligent-Tiering automatically moves objects between two access tiers (frequently and infrequently accessed) based on changing access patterns. This meets the requirement for millisecond retrieval for all objects, as objects remain accessible in the appropriate tier, and optimizes storage costs by moving less frequently accessed objects to lower-cost tiers. Transitioning to S3 Glacier Deep Archive would result in retrieval times of hours, not milliseconds, failing the retrieval requirement. Replacing S3 with EFS is a complete architectural change, overly complex, and likely more expensive for this use case, without directly addressing the cost-effective tiering of objects based on access patterns. Adding a Cache-Control header primarily affects client-side caching and CloudFront edge caching, not the underlying S3 storage tiering or long-term storage cost optimization based on object access frequency.