You have an Exchange Server 2010 organization.
An internal user named User1 sends a confidential message to another internal user named User2. User1 does not have any administrative privileges in the organization.
You need to ensure that User1 can identify whether the message was successfully delivered.
What should you instruct User1 to do?
A. View the message headers in the Sent Items folder.
B. Open Microsoft Office Outlook and modify the read receipt settings.
C. Open Microsoft Office Outlook and modify the delivery receipt settings.
D. Open the Exchange Control Panel (ECP) and select Organize EMail.
