An engineering firm has created a centralized Amazon S3 bucket in the us-east-1 region. Users from Europe & North America upload large size project-related documents to this bucket. These are critical project documents. The Project Director has instructed to have optimum performance while uploading these documents.
Which combination of actions can optimize data uploading for all users in the most effective way? (Select TWO.)

Answer options:

A.Use Multipart upload for uploading files to Amazon S3 bucket for users only in the North America region.
B.Use Multipart upload for uploading files to Amazon S3 bucket for users only in Europe region.
C.Enable Amazon S3 Transfer acceleration on Amazon S3 bucket in us-east-1 region.
D.Create an Amazon S3 bucket in the Europe region & then use Cross region replication to copy data in the central Amazon S3 bucket.
E.Use Multipart upload for uploading files to Amazon S3 bucket from all users in the North America & Europe region.

Correct Answers: C and E
Enabling Amazon S3 Transfer Acceleration on Amazon S3 bucket increases data upload performance between users in different regions than that of Amazon S3 bucket. Enabling this, data is uploaded to the nearest edge location from where it uses the optimum path to upload data to the Amazon S3 bucket in different regions.
Multipart uploads allow a single file to be uploaded in smaller parts which get assembled at the Amazon S3 bucket. For all files more than 100 Mb, it`s preferred to use multipart upload. 
For the requirement in the question, using a combination of Amazon S3 Transfer Acceleration & Multipart upload can increase data upload performance to the Amazon S3 bucket.
Option A is incorrect as these are large-sized files, Multipart upload should be used for all users, not just for users in North America.
Option B is incorrect as these are large-sized files, Multipart upload should be used for all users, not just for users in Europe.
Option D is incorrect as this will need to create an additional bucket in the Europe region with CRR which is not a cost-effective option.
For more information on Amazon S3 Transfer Acceleration & Multipart uploads, refer to the following URLs,
https://docs.aws.amazon.com/AmazonS3/latest/userguide/mpuoverview.html
https://docs.aws.amazon.com/AmazonS3/latest/userguide/transfer-acceleration.html