Your organization has 5 Mailbox servers and 5 Active directory servers.You need to install a new Mailbox server.During the installation you notice the mailbox database will not mount. What should you do to make sure you can install the mailbox server：（）

• A、Configure all domain controllers as Global Catalog Servers.
• B、Install the Exchange Server 2010 Administration Tools on a domain controller.
• C、Force the replication of the AD domain partition between all domain controllers.
• D、Force the replication of the AD configuration partition between all domain controllers.