A website runs on EC2 Instances behind an Application Load Balancer. The instances run in an Auto Scaling Group across multiple Availability Zones and deliver several static files stored on a shared Amazon EFS file system. The company needs to avoid serving the files from EC2 Instances every time a user requests these digital assets.
What should the company do to improve the user experience of the website?

Answer options:

A.Move the digital assets to Amazon Glacier.
B.Cache static content using CloudFront.
C.Resize the images so that they are smaller.
D.Use reserved EC2 Instances.

Answer - B
AWS Documentation mentions the following about the benefits of using CloudFront:
Amazon CloudFront is a web service that speeds up distribution of your static and dynamic web content, such as .html, .css, .js, and image files to your users. CloudFront delivers your content through a worldwide network of data centers called edge locations. When a user requests content that you`re serving with CloudFront, the user is routed to the edge location that provides the lowest latency (time delay), so that the content is delivered with the best possible performance. If the content is already in the edge location with the lowest latency, CloudFront delivers it immediately.
For more information on AWS CloudFront, please visit the following URL on page 3 under the section "Accelerate Static Website Content Delivery":
https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/Introduction.html
The glacier is not used for frequent retrievals. So
Option A is not a good solution. Options C & D will also not help in this situation.