A company has a web application with thousands of users. The application uses 8–10 user-uploaded images to generate AI images. Users can download the generated AI images once every 6 hours. A premium option lets users download generated AI images at any time. The company uses the user-uploaded images to run AI model training twice a year. Which storage solution meets these requirements MOST cost-effectively?

The correct option is the most cost-effective because it aligns storage classes with access patterns. User-uploaded images are accessed only twice a year for AI model training, making S3 Glacier Deep Archive ideal due to its extremely low cost for infrequent access, despite longer retrieval times. Premium user-generated AI images require immediate access, so S3 Standard is appropriate. Non-premium user-generated AI images are downloaded once every 6 hours, which is infrequent enough to benefit from the lower cost of S3 Standard-Infrequent Access (S3 Standard-IA) while still offering rapid retrieval. The other options are less cost-effective. Moving all generated AI images to S3 Glacier Flexible Retrieval would incur unnecessary retrieval costs and delays for premium users. Using S3 One Zone-IA for uploaded images is more expensive than S3 Glacier Deep Archive for data accessed only twice a year and lacks multi-AZ redundancy.