During a system maintenance window, what should a system administrator do to inhibit network logins from non-root users?
A. Set NOL OG1N-1 in /etc/default/security.
B. Edit /etc/login and add "root" on a single line.
C. Sri NOL OGIN-1 in /etc/default/security and touch /etc/nologin
D. Use the pwconv utility to create /etc/shadow
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