Your network contains a server named Server1 that runs Windows Server 2008 R2. Server1 has Microsoft Exchange Server 2010 deployed. You schedule a backup of the server. You discover that the Exchange Server 2010 transaction log files are purged during the backup. You need to prevent the Exchange Server 2010 transaction log files from being purged. What should you do? （）

• A、From the properties of the backup, add an exclusion.
• B、From the properties of the backup, modify the VSS settings.
• C、From Windows PowerShell, run the New-WBFileSpec cmdlet.
• D、From Windows PowerShell, run the New-WBBackupTarget cmdlet.