A popular educational website is facing a surge in demand for online video training. They have their large number of video content distributed between on-premise data centers & on Amazon S3 bucket in the us-west region. Students worldwide face glitches in videos & complaining about the time required to get these videos running even though each video size is less than 1 Gb. The Marketing Team expects a further increase in demand & you need to provide a scalable solution for this concern that can be deployed in the shortest time frame. Which of the following is a recommended cost-optimized scalable solution?

Answer options:

A.Use Amazon S3 Cross-Region Replication to replicate content from the us-west region to other regions.
B.Use Throughput optimized EBS volumes to save video content.
C.Use Amazon CloudFront for videos saved in on-premise & Amazon S3 origin.
D.Move all content from on-premise data centers to Amazon S3 & enable Transfer Acceleration on this bucket.

Correct Answer – C
Amazon CloudFront Can be used to offload origin server loads. In the above case, for videos saved in on-premise servers & Amazon S3 bucket, Amazon CloudFront can be used to deliver this content to users with less latency & offload load on servers.
Option A is incorrect as Using storing video content in the Amazon S3 bucket in different regions would incur additional charges.
Option B is incorrect as EBS would be preferred for rapidly changing web content. In the above case, video content would not be rapidly changing. So storing content in Amazon S3 bucket with Amazon CloudFront distribution is a better option.
Option D is incorrect as using Amazon S3 transfer Acceleration would be costly compared to Amazon CloudFront. Also, for files less than 1 Gb, using Amazon CloudFront would provide better performance than Amazon S3 Transfer Acceleration. 
For more information on using Amazon CloudFront for scalable web content, refer to the following URLs-
https://aws.amazon.com/blogs/architecture/scale-your-web-application-one-step-at-a-time/
https://aws.amazon.com/s3/faqs/