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 1 permit 192.168.1.0 0.0.0.255
line vty 0 4
login
password cisco
access-class 1
B. enable password secret line vty 0 login password cisco
line vty 0
login
password cisco
C. service password-encryption line vty 1 login password cisco
line vty 1
login
password cisco
D. service password-encryption line vty 0 4 login password cisco
line vty 0 4
login
password cisco
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