An engineer will store objects in Amazon S3 where some objects are accessed daily and others are accessed only once a year. Which S3 storage class is the most cost-effective choice for this mixed access pattern?

S3 Intelligent-Tiering is the most cost-effective choice because it automatically moves objects between two access tiers (frequent and infrequent) based on changing access patterns. This eliminates the need for manual tiering and optimizes storage costs for data with unknown or changing access patterns. S3 Standard is suitable for frequently accessed data but would be more expensive for objects accessed only once a year. S3 Glacier Deep Archive is designed for long-term archives with retrieval times in hours, making it unsuitable for daily access. S3 One Zone-Infrequent Access (S3 One Zone-IA) is cost-effective for infrequently accessed data but stores data in a single Availability Zone, offering less resilience than S3 Intelligent-Tiering and not optimizing for frequently accessed objects.