You have an Active Directory domain named contoso.com. You have an Exchange Server 2010 organization. You have a server named Server1 that runs Windows Server 2008 R2 and has the Exchange 2010 management tools and Microsoft Office Outlook 2010 installed. A support technician named User1 performs management tasks on Server1. From the Exchange Management Shell on Server1， User1 runs Export-Mailbox Identity User2@contoso.com PSTFolderPath E: \PSTFiles\User2.pst and receives the following error message： The term ®Expor-Mailbox¯ is not recognized as the name of a cmdlet， function， script， or operableprogram. Check the spelling of the name， or if a path was included， verify that the path is correct and try again. You need to ensure that User1 can successfully run the command. 
What should you do（）？ 
 

A.Assign User1 the Mailbox Import Export role.
B.Assign User1 the Full Access permissions for the mailbox of User2.
C.Add User1 to the Recipient Management security group.
D.Add User1 to the View-Only Organization Management security group.