Final answer:
To securely send large files with proprietary data, SFTP is the best choice among the options, as it encrypts the data during transfer, offering protection against unauthorized access.
Step-by-step explanation:
If you need to send several large files containing proprietary data to a business partner, the best choice from the provided options would be C) SFTP (Secure File Transfer Protocol). SFTP adds a layer of security to the file transfer process by utilizing Secure Shell (SSH) encryption. This ensures that the data remains confidential and is protected from unauthorized access during transit. Unlike standard FTP (File Transfer Protocol), which transmits data in plain text, SFTP encrypts the session, making it much more secure against interception or eavesdropping. SSH (Secure Shell) is a protocol that provides a secure channel over an unsecured network, but it is not typically used for file transfers. SNMP (Simple Network Management Protocol) is not suitable for this task, as it is not a file transfer protocol at all; instead, it is used for managing and monitoring network devices.