Your company uses System Center 2012 R2 Operations Manager.
A technician manually installs the Microsoft Monitoring Agent on a server named Server1.
You discover that the agent is configured to use the wrong primary management server.
You need to change the primary management server used by Server1.
What should you do on Server1?

A.
From the properties of the Microsoft Monitoring Agent, edit the management group and restart Microsoft Monitoring Agent service.

B.
From Notepad, edit Monitoringhost.exe.config and restart the Microsoft Monitoring Agent service.

C.
From the properties of the Microsoft Management Agent, remove the management group and add a new management group.

D.
From File Explorer, run momagent.msi and select Repair.

Explanation:
NOT D.
C)
From the properties of the Microsoft Management Agent, remove the management group and add a new management group.
http://technet.microsoft.com/en-gb/library/hh212883.aspx#bkmk_RemovingaManagementGroupfromanAgent