Which technology best achieves the goal?

Your network contains an Active Directory domain named contoso.com.
The domain contains a System Center 2012 R2 Virtual Machine Manager (VMM) deployment.
The domain contains 20 Hyper-V hosts that run Windows Server 2012 R2.
Currently, the computer accounts of all of the Hyper-V hosts are in organizational unit (OU) named Virtualization.

You plan to create two private clouds by using VMM named Cloud1 and Cloud2.
The virtual machines for Cloud1 will be hosted on two Hyper-V hosts named Server1 and Server2.
The virtual machines for Cloud2 will be hosted on two Hyper-V hosts named Server3 and Server4.
You need to recommend an administrative model for Cloud1 and Cloud2.
Which technology best achieves the goal? More than one answer choice may achieve the goal. Select the BEST answer.

A.
Two sites and two Application Administrator (Self-Service User) user roles

B.
Two host groups and two Application Administrator (Self-Service User) user roles

C.
Two OUs and two Application Administrator (Self-Service User) user roles

D.
Two logical units and two Tenant Administrator user roles

Explanation:
Host Groups are the “Organizational Units” of VMM! We need two host groups to allow us to delegate permissions and Application Administrator Roles.
User Roles in VMM:
Administrator – This role is exactly what you think, can manages the scope of everything within VMM.
Fabric Administrator – Can perform ALL administrative tasks, but only within a defined Scope. That scope can be a Host Group, a Private Cloud, or one or more
Library Servers.
Tenant Administrator – user role can define the scope of tasks performed by self-service users on their VMs, including creating and applying quotas on available
resources. So, this is the user role you should use if you want to give an administrator permission to manage self-service users and the resources they consume.
Members of the Tenant Administrator user role can also manage VM networks, including managing and deploying their own VMs within a defined scope. The scope
is limited to private cloud objects.
Application Administrator – user role can deploy and manage their own VMs within the scope and quotas defined by higher-level administrators. Note that this
user role is called the Self-Service User user role in VMM 2012 RTM.