Your company has an Exchange Server 2010 Hub Transport server named Hub1. Hub1 receives all email sent to the company from the Internet. You install the antispam agents on Hub1.

You need to ensure that Hub1 only accepts messages sent to email addresses listed in Active Directory.

What should you do?

A.
Modify the properties of the Sender Filtering agent.

B.
Modify the properties of the Recipient Filtering agent.

C.
Modify the properties of the default accepted domain.

D.
Modify the properties of the default Receive connector.

Explanation:
Reference:

http://technet.microsoft.com/en-us/library/bb123891.aspx