单选题What must an administrator do to prevent new telnet users from connecting to the system？（）Armdev -l /dev/ptsBtouch /etc/nologinCchdev -l sys0 -a nologinDchuser -a login=false ALL
单选题
What must an administrator do to prevent new telnet users from connecting to the system？（）
A
rmdev -l /dev/pts
B
touch /etc/nologin
C
chdev -l sys0 -a nologin
D
chuser -a login=false ALL
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