What AWS architecture would you recommend?

A web design company currently runs several FTP servers that their 250 customers use to upload and download large graphic files They wish to move this system to AWS to make it more scalable, butthey wish to maintain customer privacy and Keep costs to a minimum.

What AWS architecture would you recommend?
A . ASK their customers to use an 53 client instead of an FTP client. Create a single 53 bucket Create an lAM user for each customer Put the lAM Users in a Group that has an lAM policy that permits access to sub-directories within the bucket via use of the ‘username’ Policy variable.
B . Create a single 53 bucket with Reduced Redundancy Storage turned on and ask their customers to use an 53 client instead of an FTP client Create a bucket for each customer with a Bucket Policy that permits access only to that one customer.
C . Create an auto-scaling group of FTP servers with a scaling policy to automatically scale-in when minimum network traffic on the auto-scaling group is below a given threshold. Load a central list of ftpusers from 53 as part of the user Data startup script on each Instance.
D . Create a single 53 bucket with Requester Pays turned on and ask their customers to use an 53 client instead of an FTP client Create a bucket tor each customer with a Bucket Policy that permits access only to that one customer.

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Answer: A