What is the function of Secure FTP (SFTP)?

The function of Secure FTP (SFTP) is centered around the encryption of both login credentials and the data being transferred. This secure method of file transfer ensures that sensitive information remains confidential and protected from unauthorized access during transmission over a network, which is especially crucial in clinical trials and other fields dealing with sensitive data.

Encryption safeguards against potential threats such as eavesdropping and interception that could occur when transferring files over less secure protocols. By securing the data in transit and requiring the authentication of both parties involved, SFTP creates a safe channel for communication and data exchange. Thus, this focus on protecting information makes option B the correct one in the context of SFTP’s primary purpose.