A public archives organization is about to move a pilot application. They are running on AWS into production. You have been hired to analyze their application architecture and give high-availability and cost-saving recommendations. The application displays scanned historical documents.

Answer options:

A.Deploy an Amazon CloudFront distribution in front of the Amazon S3 tiles bucket.
B.Increase the size (width/height) of the individual tiles at the maximum zoom level.
C.Use the S3 INTELLIGENT_TIERING storage class. 
D.Decrease the size (width/height) of the individual tiles at the maximum zoom level.
E.Store the maximum zoom level in the low-cost Amazon S3 Glacier option and only retrieve the most frequently access tiles as they are requested by users.

Answer – A, B, and C
Option A is CORRECT because CloudFront does the caching via the edge locations, reducing the load on the origin.
Option B is CORRECT because increasing the size of the images would help reduce the cost of the number of GET/PUT requests on the origin server.
Option C is CORRECT, INTELLIGENT_TIERING storage class is designed to optimize storage costs by automatically moving data to the most cost-effective storage access tier, without performance impact or operational overhead.
https://docs.aws.amazon.com/AmazonS3/latest/dev/s3-dg.pdf (Page 104 - 105)
Option D is incorrect because decreasing the size would require more requests and will increase the overall cost.
Option E is incorrect because Glacier is an archival solution and will not be suitable for frequent access to the tiles.