Which port should you open on the firewall?

Your network contains an internal network and a perimeter network.
The networks are separated by a firewall. The internal network contains a Lync Server 2010 pool.
The perimeter network contains a Lync Server 2010 Edge pool.
You discover that updates to the Lync Server 2010 topology do not replicate to the Edge Servers.
You need to ensure that the Lync server replicates successfully to the Edge Servers.
Which port should you open on the firewall?

A.
80

B.
443

C.
4443

D.
8080

Explanation:
http://social.technet.microsoft.com/Forums/en-US/ocsaddressbook/thread/3fe9e121-a63a-4a56-a94b-312ebab1c05a

http://social.technet.microsoft.com/Forums/en/ocsplanningdeployment/thread/f2730d13-b416-4a4b-9fa3-019be268c970