A company needs its on-premises applications to store and retrieve files in Amazon S3 using standard file system protocols. Which AWS service provides this capability?

Amazon S3 File Gateway is the correct choice because it provides a file interface to Amazon S3, allowing on-premises applications to store and retrieve objects in S3 using standard file protocols like NFS and SMB. It presents S3 as a network file share, making S3 accessible without modifying existing application code. AWS DataSync is used for high-speed online data transfer between on-premises storage and AWS storage services, not for providing a file system interface to S3 for ongoing application access. AWS Snowball Edge is a data migration device for large-scale data transfer and edge computing, not a persistent file gateway. AWS Transfer Family provides fully managed support for file transfers directly into and out of Amazon S3 using SFTP, FTPS, and FTP, but it's for file transfer protocols, not standard network file system protocols for application integration.