Martin works as a network administrator in a company.

The Cisco IOS command copy running-configuration ftp backs up the router’s running configuration to an FTP server, as Martin needs. Options A and B are invalid syntax (and duplicated).

Option D (tftp):Uses TFTP, not FTP.

“The copy running-configuration ftp command in Cisco IOS transfers the router config to an FTP server for backup” (Module: Network Device Management, Section: Cisco Backup Commands).