You are designing the Active Directory infrastructure to meet the business and technical requirements. You run ADSizer, and find that it provides a solution that contains only one domain controller for Amsterdam. What should you do?（）

• A、Place at least two domain controllers in Amsterdam.
• B、Configure the domain controller as a bridgehead server.
• C、Configure the domain controller as a global catalog server.  
• D、Distribute the users among sites in ADSizer and recalculate the number of domain controllers.