单项选择题

A.AlldomaincontrollersrunWindowsServer2008R2andareconfiguredasDNSservers.AdomaincontrollernamedDC1hasastandardprimaryzoneforcontoso.com.AdomaincontrollernamedDC2hasastandardsecondaryzoneforcontoso.com.Youneedtoensurethatthereplicationofthecontoso.comzoneisencrypted.Youmustnotloseanyzonedata.Whatshouldyoudo()
A.Onbothservers,modifytheinterfacethattheDNSserverlistenson.
B.ConverttheprimaryzoneintoanActiveDirectory-integratedzone.Deletethesecondaryzone.
C.ConverttheprimaryzoneintoanActiveDirectory-integratedstubzone.Deletethesecondaryzone.
D.Configurethezonetransfersettingsofthestandardprimaryzone.ModifytheMasterServerslistsonthesecondary