Which of the following services can be used to optimize performance for global users to transfer large-sized data objects to a centralized Amazon S3 bucket in us-west-1 region?

Answer options:

A.Enable S3 Transfer Acceleration on Amazon S3 bucket.
B.Use Amazon CloudFront Put/Post commands
C.Use Multipart upload
D.Use Amazon ElastiCache

Correct Answer – A
S3 Transfer Acceleration can optimise performance for data transfer between users & objects in Amazon S3 bucket. Transfer acceleration uses CloudFront edge location to provide accelerated data transfer to users.
Option B is incorrect as Amazon CloudFront Put/Post commands can be used for small-sized objects but for large-sized data objects, S3 Transfer Acceleration provides better performance.
Option C is incorrect as users should use Multipart uploads for all data objects exceeding 100 megabytes. But for better performance, S3 transfer acceleration should be enabled.
Option D is incorrect as for global users accessing S3 bucket, S3 Transfer Acceleration is a better choice.. 
For more information on Amazon S3 Transfer Acceleration, refer to the following URLs:
https://aws.amazon.com/s3/faqs/#s3ta
https://docs.aws.amazon.com/AmazonS3/latest/dev/optimizing-performance.html