You have an Exchange Server 2010 SP1 organization. The organization contains two mailbox-enabled users named User1 and User2

You need to ensure that User1 can send email messages on behalf of User2

Which cmdlet should you use?

A.
Set-MailUser.

B.
Set-MailboxFolderPermissions.

C.
New-TransportRule.

D.
Set-Mailbox.

E.
New-MailContact.

F.
New-ManagementScope.

G.
New-ManagementRoleAssignment.

H.
Set-Group.

I.
Set-ManagementRoleAssignment.

J.
Add-ADPermission.

Explanation:
Set-Mailbox. e.g.- Set-Mailbox user2 -GrantSendOnBehalfTo user1

Reference:

http://technet.microsoft.com/en-us/library/bb123981.aspx