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- 单项选择题You have an Exchange Server 2010 organization that contains a single Mailbox server.The Mailbox server contains two mailbox databases named DB1 and DB2.You need to restore a backup of DB1.Users must be able to connect to their mailboxes on DB1 during the restore process.What should you create first？（）
A、a database availability group （DAG）
B、a Client Access server array
C、a Recovery Mailbox database
D、a recovery storage group
- C
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