You need to ensure that Server2 can send security events to Server1

Your company has a private cloud that is managed by using a System Center 2012 Operations
Manager infrastructure.
The network contains two servers named Server1 and Server2 that run Windows Server 2008 R2.
The private cloud contains two servers. The servers are configured as shown in the following table.

The network segments are separated by a firewall. All of the TCP ports from 1 to 1024 are allowed
on the firewall.
You need to ensure that Server2 can send security events to Server1.
What should you do?

A.
From the firewall, allow TCP 5723 from Network2 to Network1.

B.
Deploy an Operations Manager gateway server.

C.
From the firewall, allow TCP 51909 from Network2 to Network1.

D.
From the firewall, allow TCP 51909 from Network1 to Network2.

E.
Deploy an SMTP smart host.

F.
From the firewall, allow TCP 5723 from Network1 to Network2.

Explanation:
ACS Forwarders Separated from the ACS Collector by a Firewall Because of the limited
communication between an ACS forwarder and an ACS collector you only need to open the inbound
TCP port 51909 on a firewall to enable an ACS forwarder, separated from your network by a firewall,
to reach the ACS collector.
http://technet.microsoft.com/en-us/library/bb309575.aspx