Which solution meets these requirements and is MOST cost-effective?

A company has NFS servers in an on-premises data center that need to periodically back up small amounts of data to Amazon S3.

Which solution meets these requirements and is MOST cost-effective?
A . Set up AWS Glue to copy the data from the on-premises servers to Amazon S3.
B . Set up an AWS DataSync agent on the on premises servers, and sync the data to Amazon S3.
C . Set up an SFTP sync using AWS Transfer for SFTP to sync data from on premises to Amazon S3.
D . Set up an AWS Direct Connect connection between the on-premises data center and a VPC, and copy the data to Amazon S3

Answer: C