Go back to 74-324 - Administering Office 365 for Small Businesses

Question :-

You need to ensure that all email messages sent and received by a specific Office 365 user are accessible to the Audit department for 60 days, even if the user permanently deletes the messages. What should you do?
Run the Set-MailboxDatabase Windows PowerShell cmdlet and specify the - EventHistoryRetentionPeriod parameter.
Run the Set-MailboxDatabase Windows PowerShell cmdlet and specify the - DeletedItemRetention parameter.
Run the Set-Mailbox Windows PowerShell cmdlet and specify the - SingleItemRecoveryEnabled parameter.
Run the Set-Mailbox Windows PowerShell cmdlet and specify the - LitigationHoldEnabled parameter.

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