ournetworkconsistsofasingleActiveDirectorydomain.YouhaveadomaincontrollerandamemberserverthatrunWindowsServer2008R2.BothserversareconfiguredasDNSservers.ClientcomputersruneitherWindowsXPServicePack3orWindows7.Youhaveastandardprimaryzoneonthedomaincontroller.Thememberserverhostsasecondarycopyofthezone.Youneedtoensurethatonlyauthenticatedusersareallowedtoupdatehost（A）recordsintheDNSzone.Whatshouldyoudofirst（）

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