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.