Technically, expedited retrieval for files is not guaranteed within 1-5 minutes for files larger than 250 MB+. See https://docs.aws.amazon.com/AmazonS3/latest/userguide/restoring-objects-retrieval-options.html.

S3 Standard-IA is for data that is accessed less frequently, but requires rapid access when needed. S3 Standard-IA offers the high durability, high throughput, and low latency of S3 Standard, with a low per GB storage price and per GB retrieval chargehttps://aws.amazon.com/s3/storage-classes/

A is most correct ✅

"Expedited Retrieval, you can retrieve small amounts of data (up to 250 MB per request) within 1-5 minutes." Cannot C

(A) is eliminated. Demand metric is popularly based & cannot be configured with Lifecycle policies. Ex: an old movie can have resurgent demand 20 years after it's sequel is released. (C) is eliminated. Expedited retrieval is for all but the largest archived objects (250 MB+). (D) is eliminated. Bulk retrieval takes hours. (B) is more expensive than S3 Glacier Flexible Retrieval but it's the only one that works.

AS the pattern is uncertain- Customer could not, in advance, segregate data, the pattern will be determined on the fly - and with regard of the following S3 feature: S3 Intelligent-Tiering is an additional storage class that provides flexibility for data with unknown or changing access patterns. It automates the movement of your objects between storage classes to optimize cost. C will be the most cost effective for this use case.

Expedited 1-5min and for new files intelligent tier is a good option

All old files should be in--> Glacier Flexible Retrieval takes (1-5 minutes) to retrieve the file. New files should not stay in Standard Storage class forever --> Intelligent-Tiering

I don't think C is an option, S3 Glacier Flexible takes hour to retrieve the data. Option A is actually valid, but the way the option A describe it does not consider "demand patterns based on time" So it should be B

There is something I like about option A. It's the only one that deals with what happens with a movie that goes from "new" to "old". With other options, new movies will be new forever.

Option B makes the most sense. Why not option C: 1. This is not an archival use case, the company runs a video streaming service, so objects are still accessed regularly. Accelerated Retrieval is designed for "occasional urgent requests for a subset of archives". 2. The 5 minute timeframe does not apply to items of 250+ MB. 3. Even if the timeframe were valid, it's not guaranteed ("typically") 4. Expedited retrieval is expensive if used frequently ($10.00 per 1,000 requests) - depending on access patterns, this may more than offset the savings in storage costs. https://docs.aws.amazon.com/AmazonS3/latest/userguide/restoring-objects-retrieval-options.html

Option C

Expedited Retrievals (1-5 minutes) Intelligent-Tiering cost

Expedited Retrievals (1-5 minutes) - Intelligent-Tiering cost

I go with C

C -> Expedited Retrievals (1-5 minutes) - Intelligent-Tiering cost (cost effective) D -> Bulk retrievals (5-12 hours) A -> does not consider demand patterns B -> It's ok, but "C" is more good fit to access patterns

option A is most correct option B..for moving files to standard IA , it needs to stay in S3 standard for minimum 30 days. option C..expedited retrieval does not necessarily guarantee big size file retrieval in <=5 minutes. option D... is also wrong as it would take time in hours. sam