单项选择题

Your Exchange Server 2010 organization contains the servers shown in the following table.

Server1 and Server2 are members of a database availability group (DAG).You shut down 
Server1.Some users report that they cannot access their mailboxes.You need to ensure that all users can connect to their mailboxes if a single Mailbox server becomes unavailable.What should you do?()

A.Create a Client Access server array.
B.Configure the shadow redundancy settings.
C.Remove the Hub Transport server role from Server1.
D.Add mailbox database copies to Server1 and Server2.

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