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 vtyO 4
login
password cisco
access-class 1

B.
enable password secret
line vtyO
login
password cisco

C.
service password-encryption
line vtyO
login
password cisco

D.
service password-encryption
line vtyO 4
login
password cisco