Your company has a single Active Directory directory service forest with multiple domains. The  company has a main office with 1，000 users and a single branch office with 500 users. Each office is aseparate Active Directory site. The main office Active Directory site has two domain controllers with Global  Catalog services. Company employees must be able to work in both offices. You need to plan the  placement and configuration of domain controllers.  What should you do？（）

• A、 Deploy two additional domain controllers in the main office Active Directory site.
• B、 Deploy global catalog servers in the branch office Active Directory site.
• C、 Enable change notification on the site link between the main office Active Directory site and the branch office Active Directory site.
• D、 Disable change notification on the site link between the main office Active Directory site and the branch office Active Directory site.