Which AWS Transfer Family service allows for secure file transfers over the SFTP protocol?

The correct answer is based on the specific functionality of the AWS Transfer Family services. AWS Transfer for SFTP is explicitly designed to facilitate secure file transfers using the Secure File Transfer Protocol (SFTP). This service allows users to transfer files into and out of Amazon S3 over a secure and encrypted connection, making it ideal for scenarios that require data protection and security compliance.

When utilizing AWS Transfer for SFTP, users benefit from the ability to manage access control to S3 buckets easily, maintain secure connections, and take advantage of the scalability and durability of Amazon S3 for file storage. This makes it particularly well-suited for organizations that require secure, robust file transfer solutions.

The other services in the AWS Transfer Family, while they may support other protocols such as FTP and HTTP, do not provide secure SFTP transfers. Since SFTP specifically emphasizes encryption and security in data transfer, only AWS Transfer for SFTP meets this requirement.