A.Createad.contoso.comasastandardprimaryDNSZone.
B.Createad.contoso.comasanActiveDirectoryIntegratedDNSZone.
C.EnableonlyauthorizedclientcomputerstoupdateDNS.
D.ConfigureazonetransferbetweentheDNSserverattheISPandtheDNSserversatContoso.Ltd.
