问题：

[单选]

Your company has a main office and three branch offices. The network consists of a single Active  
Directory domain. Each office contains an Active Directory domain controller. You need to create a DNS  
infrastructure for the network that meets the following requirements：  
èThe DNS infrastructure must allow the client computers in each office to register DNS names within their. 
respective offices.   
èThe client computers must be able to resolve names for hosts in all offices.
What should you do？（）

A . Create an Active Directory-integrated zone at the main office site.
B . Create a standard primary zone at the main office site and at each branch office site.
C . Create a standard primary zone at the main office site. Create a secondary zone at each branch office  site.
D . Create a standard primary zone at the main office site. Create an Active Directory-integrated stub zone at each branch office site.