You install an Exchange Server 2010 Hub Transport server named Hub1.
You need to ensure that Hub1 can receive e-mail messages sent from Internet hosts.
What should you do?

A.
Enable the Anonymous users permission group for the Client Hub1 Receive connector.

B.
Enable the Anonymous users permission group for the Default Hub1 Receive connector.

C.
Create a Receive connector and set the intended use to Client. Modify the port for the
connector.

D.
Create a Receive connector and set the intended use to Custom. Modify the remote IP
addresses range for the connector.

Explanation:

http://technet.microsoft.com/en-us/library/bb738138.aspx