A network administrator needs to allow only one Telnet connection to a router. For anyone viewing the configuration and issuing the show run command, the password for Telnet access should be encrypted. Which set of commands will accomplish this task?
A. service password-encryption access-listl permit 192.168.1.0.0.0.0.255 line vty0 4 login password cisco access-class 1
B. enable password secret line vty0 login password cisco
C. service password-encryption line vty0 login password cisco
D. service password-encryption line vty0 4 login password cisco
