单项选择题
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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IBMremotesupportforhardwaremaintenanceisrequiredforseveralmissioncriticalPower595servers.Thedatacenterisverysecurityconsciousanddoesnotallowinternetaccess.HowshouldanadministratorconfigureoutboundconnectivityofElectronicServiceAgent？（）
A.VPN
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WhichcommandwilldetermineiftheTrustedComputerBaseisenabledonasystem？（）
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B.getsecconf
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WhichwebsiteprovidesaccesstoAIXTechnologyLevelupdates？（）
A.AIX Tips
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C.Critical Fixes
D.pSeries and AIX Information Center
