Your company has three departments named Sales, Marketing, and Finance.
The network contains an Active Directory domain named contoso.com. You have an
Exchange Server 2010 Service Pack 1 (SP1) organization that contains the servers
configured as shown in the following table.

You create an Edge Subscription for Server2.
You need to prevent the company’s server from accepting email messages from servers on
the Internet that are known to originate spam.
What should you add to the organization?

A.
an accepted domain

B.
a new federation trust

C.
an IP Block List Provider

D.
an Edge Transport rule

E.
a new Send connector

F.
an attachment filter entry

G.
a new Edge Subscription

H.
a remote domain

I.
a new journal rule

J.
a new Receive connector
K.
a Hub Transport rule
L.
a new organization relationship

Explanation:

http://technet.microsoft.com/en-us/library/aa997658.aspx
http://exchangeserverpro.com/exchange-2010-edge-transport-server-configuring-ip-blocklist-providers