You work as the enterprise exchange administrator at Xxx .The Xxx network is running in a Microsoft Exchange Server 2010 environment.The Xxx network has two Mailbox servers named XXX-EX01 and XXX-EX02.You are busy implementing a database availability group （DAG）. What actions must you take to guarantee mailbox databases replications on XXX-EX01 and XXXEX02？（）

• A、You must implement a custom Send connector
• B、You must install the Active Directory Connector （ADC）
• C、You must change the Database paths
• D、You must change the membership list of the DAG