单项选择题

A.AlIdomaincontrollersrunWindowsServer2008andareconfiguredasDNSservers.ThedomaincontainsoneActiveDirectory-integratedDNSzone.YouneedtoensurethatoutdatedDNSrecordsareautomaticallyremovedfromtheDNSzone.Whatshouldyoudo()
A.Fromthepropertiesofthezone,enablescavenging.
B.Fromthepropertiesofthezone,disabledynamicupdates.
C.Fromthepropertiesofthezone,modifytheTTLoftheSOArecord.
D.Fromthecommandprompt,runipconfig/flushdns.