You work as an administrator at ABC.com. The ABC.com network consists of a single domain
named ABC.com. All servers on the ABC.com network have Windows Server 2008 R2 installed.
ABC.com makes use of System Center 2012 Operations Manager in their environment. You have
been instructed to make sure that you are able to monitor workstations in an untrusted domain.
A firewall is configured between the ABC.com domain and the untrusted domain. You then
configured conditional forwarding for name resolution across the domains, and installed a
Gateway Server in the untrusted domain.
You now need to open a TCP port on the firewall.
Which of the following is the TCP port that should be opened?

A.
TCP port 135

B.
TCP port 5718.

C.
TCP port 5719.

D.
TCP port 5723.