Your network contains an Exchange Server 2010 Mailbox server.The server has one mailbox database.A user named User1 reports that he has multiple corrupted e-mail messages in his mailbox.You need to recover User1ˉs -mail messages.The solution must not delete any other e-mail messages in the mailbox database.What should you do？（）

• A、Create a new Mailbox Recovery Database， restore a backup of the database file， and then run the Export-Mailbox cmdlet.
• B、Create a new Mailbox Recovery Database， restore a backup of the database file， and then run the Restore-Mailbox cmdlet.
• C、Create a database availability group （DAG）， restore a backup of the mailbox database file， and then run the Restore-Mailbox cmdlet.
• D、Create a database availability group （DAG）， restore a backup of the mailbox database file， and then run the Export-Mailbox cmdlet.