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-list 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