单项选择题

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 e-mail message.
What should you do?()

A.Configure a MailTip.
B.Create a transport rule.
C.Create a Send connector.
D.Configure an expansion server.

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