You are designing the DNS zone to support the Active Directory domain for Contoso.Ltd.  Which two actions should you perform？ （）

• A、 Create ad.contoso.com as a standard primary DNS Zone.
• B、 Create ad.contoso.com as an Active DirectoryIntegrated DNS Zone.
• C、 Enable only authorized client computers to update DNS.
• D、 Configure a zone transfer between the DNS server at the ISP and the DNS servers at Contoso.Ltd.