Examine the extract of the /etc/nologin file and the /etc/pam.d/login file on server1:
Which statement is true about users?
A. Only the root user can log in to the system
B. Only users root, bob and smith would be unable to log in to the system
C. All users, including the root user, would be permitted to log in to the system
D. All users, including the root user, would be unable to log in to the system
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