Answer: Move the data objects to S3 Standard-Infrequent Access (S3 Standard-IA) after 30 days.

## Explanation **Correct Answer: B** **Why Option B is correct:** 1. **Immediate accessibility**: S3 Standard-IA provides immediate access to data (millisecond retrieval) unlike S3 Glacier Deep Archive which has retrieval times ranging from hours to days. 2. **Same high availability and resiliency**: S3 Standard-IA offers 99.9% availability and 99.999999999% durability (11 nines), which matches the high availability and resiliency requirements of S3 Standard. 3. **Cost optimization**: S3 Standard-IA has lower storage costs than S3 Standard but higher retrieval costs, which is suitable for infrequently accessed data (75% of data rarely accessed after 30 days). 4. **30-day lifecycle**: Moving data after 30 days aligns with the finding that 75% of data is rarely accessed after this period. **Why other options are incorrect:** **A. S3 Glacier Deep Archive**: - Does NOT provide immediate accessibility (retrieval times: 12 hours for standard, up to 48 hours for bulk) - Not suitable for data that needs to remain "immediately accessible" **C. S3 One Zone-IA**: - Does NOT provide the "same high availability and resiliency" as S3 Standard - Stores data in only one Availability Zone (lower availability: 99.5% vs 99.9%) - Lower durability (99.999999999% but only within one zone) - Higher risk of data loss if the single zone fails **D. S3 One Zone-IA immediately**: - Same issues as option C regarding availability and resiliency - Additionally, moving data immediately would not optimize costs effectively since some data might still be frequently accessed in the first 30 days **Key AWS Concepts:** - **S3 Standard-IA**: For infrequently accessed data that requires rapid access when needed - **S3 One Zone-IA**: For infrequently accessed data that can be recreated if lost (lower availability) - **S3 Glacier Deep Archive**: For archival data with retrieval times of hours - **S3 Lifecycle Policies**: Automatically transition objects between storage classes based on age **Best Practice**: Use S3 Standard-IA for data that is infrequently accessed but still needs immediate availability and high durability, which perfectly matches the requirements in this scenario.

Author: LeetQuiz Editorial Team