What should a solutions architect do to reduce costs?

A company’s packaged application dynamically creates and returns single-use text files in response to user requests. The company is using Amazon CloudFront for distribution^ but wants to further reduce data transfer costs. The company cannot modify the application’s source code

What should a solutions architect do to reduce costs?
A . Use Lambda@Edge to compress the files as they are sent to users.
B . Enable Amazon S3 Transfer Acceleration to reduce the response times
C . Enable caching on the CloudFront distribution to store generated files at the edge.
D . Use Amazon S3 multipart uploads to move the files to Amazon S3 before returning them to users

Answer: C