Your network contains an Active Directory forest. All domain controllers run Windows Server 2008 and are configured as DNS servers. You have an Active Directory-integrated zone for contoso，com. You have a Unix-based DNS server， You need to configure your Windows Server 2008 environment to allow zone transfers of the contoso，com zone to the Unix-based DNS server. What should you do in the DNS Manager console（）

• A、Disable recursion.
• B、Create a stub zone.
• C、Create a secondary zone.
• D、Enable BIND secondaries.