Which site system role should the clients use?

You have a deployment of Microsoft System Center 2012 R2 Configuration Manager.
You need to ensure that you can view the client site assignment status messages of all clients by
using Configuration Manager, even if the management point is unavailable.
Which site system role should the clients use?

A.
an out of band service point

B.
a reporting services point

C.
a System Health Validator point

D.
a fallback status point

Explanation:
http://blogs.technet.com/b/cmpfekevin/archive/2013/03/05/what-is-fallback-and-what-does-itmean.aspx