Your company has an Exchange Server 2007 environment. You create a dynamic distribution group named Sales Team that contains all users in the sales department. Users in the sales department report that external e-mail messages that are sent to the Sales Team distribution group are not being delivered. You need to ensure that external e-mail that is sent to Sales Team is delivered to all users in the sales department. What should you do?

A.
Clear the Reject messages from check box on the user accounts of all users in the sales department

B.
Clear the Reject messages from check box on the Sales Team distribution group

C.
Clear the Require that all senders are authenticated check box on the user accounts of all users in the sales department

D.
Clear the Require that all senders are authenticated check box on the Sales Team distribution group