version 15.1 service timestamps debug datetime msec localtime service timestamps log datetime msec localtime no service password-encryption ! hostname R1 ! enable secret 5 $1$W6jy$LG3yENq/ceoirwdms1 ! interface GigabitEthernet0 ip address 10.1.1.1 255.255.255.0 ip access-group 120 in duplex auto speed auto ! access-list 120 deny tcp any any eq 22 access-list 120 permit ip any any ! line con 0 password 7 07838475874 login line vty 0 4 login line vty 5 15 login ! end

A R1 administrator cannot establish a Telnet session with the R1 router. What is the cause of this failure?

A.	A MD5 (secret) password is not set.
B.	An access-list 120 is blocking Telnet access.
C.	The vty password is missing.
D.	The console password is missing.