You have an Exchange Server 2010 organization.

You have a group named Group1 that contains 10,000 members.

You need to ensure that an informative message is displayed when users add Group1 to the recipient list of an email message.

What should you do?

A.
Configure a MailTip.

B.
Create a transport rule.

C.
Create a Send connector.

D.
Configure an expansion server.