What feature of Enhanced FTP allows for secure file transfer in Marketing Cloud?

The feature that allows for secure file transfer in Marketing Cloud is Secure Socket Layer (SSL) encryption. This technology provides a secure channel over an insecure network, such as the internet, ensuring that data transferred between the client and server remains private and integral. SSL encryption protects sensitive information from being intercepted by unauthorized parties during the transfer process.

Other options, while related to file transfer and data handling within Marketing Cloud, do not inherently provide the secure encryption function that SSL offers. For instance, FTP Data Import generally involves standard file transfer methods without the added layer of encryption. Standard FTP uploads are not secure by design, as they do not encrypt data, making it vulnerable to interception. Automated FTP scheduling pertains to the timing and automation of file transfers rather than the security of those transfers. Thus, the emphasis on SSL encryption highlights the critical aspect of secure file transfers in the Marketing Cloud environment.