A company has Active Directory Domain Services (AD DS) domain controllers that run on Windows Server
2012 R2 servers. There are two forests, and each has a single domain. There is a two-way forest trust betweenthe forests. The company uses Hyper-V for server visualization. The Hyper-V environment contains the HyperV host servers as shown in the following table:

You prepare to deploy System Center 2012 R2 Data Protection Manager (DPM) to back up the Hyper-V
environment. The deployment must meet the following requirements:

Ensure that all Hyper-V servers can be backed up from a minimum of two DPM servers
Minimize the total number of DPM servers
You need to deploy DPM to the environment.
What should you deploy?

A.
four DPM servers in the internal network and two DPM servers in the perimeter network

B.
two DPM servers in the internal network and one DPM server in the perimeter network

C.
two DPM servers in the internal network only

D.
two DPM servers in the internal network and two DPM servers in the perimeter network

Explanation:
DPM can protect servers and workstations across domains within a forest that has a twoway trust relationship
with the domain that the DPM server is located in. If there is not a two-way trust across domains, you can
protect the computers using DPM’s support for computers in workgroups or untrusted domains.
For more information, see Managing Protected Computers in Workgroups and Untrusted Domains. DPM
supports data protection across forests as long as you establish a forest-level, two-way trust between the
separate forests.

http://technet.microsoft.com/en-us/library/hh758176.aspx