【单选题】
A system administrator receives a new server and has booted the system for the first time. The administrator has set up the terminals and users. The user start to log on. Root is logged in on the console. When additional users start to log in, an error is displayed stating that All available login sessions are in use. Which of the following steps should be followed to resolve this problem?（）
A、Permissions on /etc/security were changed in error; do a chmod 755 on /etc/security directory.
B、Increase the number of licenses; using smit chaili cense
C、Change the Maximum number of PROCESSES allowed per user variable; using smit chgsys.
D、Change User can logi field from false to true: using smit chuser.
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