The correct answer is C. Secure File Transfer Protocol.
SFTP is a secure file transfer protocol that runs on top of the SSH protocol. It is used to transfer files between computers over a network. SFTP is more secure than FTP because it uses encryption to protect the data being transferred.
A. Safe File Transfer Practices is not a correct answer because it is not a real acronym.
B. Safe File Transfer Protocol is not a correct answer because it is not the full form of SFTP.
D. Secure File Transfer Practices is not a correct answer because it is not the full form of SFTP.