. S3 One Zone-Infrequent Access (S3 One Zone-IA)

S3 Glacier Flexible Retrieval. S3 One Zone-IA (Infrequent Access) costs $0.01/GB whereas S3 Glacier Flexible costs $0.0036/GB.

S3 Glacier Flexible Retrieval – Use for archives where portions of the data might need to be retrieved in minutes. Data stored in the S3 Glacier Flexible Retrieval storage class has a minimum storage duration period of 90 days and can be accessed in as little as 1-5 minutes by using an expedited retrieval. The retrieval time is flexible, and you can request free bulk retrievals in up to 5-12 hours. If you delete, overwrite, or transition the object to a different storage class before the 90-day minimum, you are charged for 90 days. Amazon S3 supports restore requests at a rate of up to 1,000 transactions per second, per AWS account for S3 Glacier Flexible Retrieval.

https://www.techtarget.com/searchstorage/tip/A-guide-to-AWS-storage-cost

B is cheaper than C

ChatGPT: S3 One Zone-Infrequent Access (S3 One Zone-IA) is a storage class within Amazon S3 that is designed for data that is infrequently accessed but still needs to be retrievable within 12 hours. It offers a lower storage cost compared to S3 Standard and is suitable for scenarios where data durability and availability in a single Availability Zone are acceptable. This makes it a cost-effective solution for storing data that is accessed less frequently but still needs to be accessible within a reasonable timeframe. Why not B? S3 Glacier Flexible Retrieval (option B) is not the most suitable option for the given scenario because it's designed for long-term archival storage with infrequent access. While it does offer a low storage cost, retrieving data from Glacier typically takes longer than 12 hours because Glacier is optimized for long-term storage at a lower cost with retrieval times ranging from minutes to hours, depending on the retrieval option chosen.

Cost-effective -> answer is C

The most suitable Amazon S3 storage class for the company's needs is: C. S3 One Zone-Infrequent Access (S3 One Zone-IA) Here's why: Cost-effectiveness: S3 One Zone-IA offers the lowest storage cost per gigabyte among the listed options, making it ideal for infrequently accessed data. 12-hour retrieval: Meets the company's retrieval time requirement of 12 hours, with an average retrieval time of 3.5 hours and a maximum of 12 hours. Availability: Stores data in a single Availability Zone, which reduces costs compared to multi-AZ options like S3 Standard-IA. However, remember that data in a single AZ is susceptible to complete loss if that AZ experiences an outage.

https://aws.amazon.com/s3/storage-classes/#:~:text=S3%20Glacier%20Flexible%20Retrieval%20(formerly%20S3%20Glacier)%2C%20with%20retrieval%20in%20minutes%20or%20free%20bulk%20retrievals%20in%205%E2%80%9412%20hours.%20To

S3Glacier Flexible Retrieval Bulk data retrievals and requests are free of charge.

B is correct Amazon S3 Glacier Flexible Retrieval (formerly Amazon S3 Glacier): • Expedited (1 to 5 minutes), Standard (3 to 5 hours), Bulk (5 to 12 hours) – free