Exam AWS Certified Solutions Architect - Associate SAA-C03 topic 1 question 651 discussion

Images cannot be lost = high availability. Transition the objects to S3 Standard-Infrequent Access (S3 Standard-IA) after 180 days, S3 Glacier Instant Retrieval after 360 days, and S3 Glacier Deep Archive after 5 years.

https://aws.amazon.com/s3/storage-classes/glacier/

IMO answer is C

"The developer needs to configure an S3 Lifecycle rule."--->One Zone-IA can't transfer to Glacier Instant Retrieval--->A is out. Check - Unsupported lifecycle transitions https://docs.aws.amazon.com/AmazonS3/latest/userguide/lifecycle-transition-general-considerations.html "Images cannot be lost = high availability"--->Can't be One Zone-IA--->B is out. "the images need to be archived but must be available instantly upon request"--->Can't be "Flexible" Retrieval--->D is out. Only C is the correct answer.

A. Here's why this option is the most cost-effective: +S3 One Zone-IA (after 180 days): Offers lower storage costs compared to S3 Standard for infrequently accessed data (180 - 360 days) while maintaining good availability for retrieval. +S3 Glacier Instant Retrieval (after 360 days): Provides immediate access to archived images (360 - 5 years) at a significantly lower cost than S3 Standard storage. Retrieval costs are incurred but typically lower than keeping the data in S3 Standard. +S3 Glacier Deep Archive (after 5 years): Offers the lowest storage cost for long-term archival (beyond 5 years) with retrieval times within 12 hours, meeting the auditor access requirement and minimizing ongoing storage costs.

https://aws.amazon.com/s3/storage-classes/glacier/#:~:text=S3%20Glacier%20Flexible%20Retrieval%20delivers,year%20and%20is%20retrieved%20asynchronously. S3 Glacier Flexible Retrieval delivers low-cost storage, up to 10% lower cost than S3 Glacier Instant Retrieval. Flexible retrieval is cheaper than Instant retrieval. S3 Glacier Flexible retrieval storage class provides minutes to 12 hours retrieval of data. Which is within the required time by auditors. --> We should select flexible retrieval. The design is not caring about the high availability. The design is caring about cost. One zone-IA is cheaper than standard IA. --> We should select One Zone IA.

A, B impose risk of the images being lost in case of AZ failure D does not allow instant access after 180 days

Images cannot be lost = high availability. A exposes images to risk

The images cannot be lost during this process.

"The images cannot be lost during this process" , imho this rules out S3 One zone infrequent access. S3 Glacier Instant Retrieval gives immediate access. S3 Glacier Flexible Retrieval does not give immediate access. so C.

high availability is not mentioned, thus I go for A

I'll go for A as it doesn't talk about High availability. Considering cost. I'll go for A