Your network contains servers that have System Center 2012 Virtual Machine Manager (VMM) installed and servers that have System Center 2012 App Controller
installed.
You create a private cloud named Cloud1.
You add a VMM connection in App Controller.
You verify that you can connect to Cloud 1 from the App Controller portal.
A user named User1 fails to connect to Cloud1 from the App Controller portal, as shown in the exhibit.
(Click the Exhibit button.)
You need to ensure that User1 can connect to Cloud1 from the App Controller portal.
What should you do?
Exhibit:

A.
From the VMM Administrator Console, modify the properties of Cloud1.

B.
From the VMM Administrator Console, create a User Role.

C.
From the App Controller portal, create a User Role.

D.
From the App Controller portal, modify the properties of the VMM connection.

Explanation:
http://technet.microsoft.com/en-us/library/gg696971.aspx
Virtual Machine Manager (VMM) to define the objects that You can create user roles in System Center 2012
users can manage and the management operations that users can perform.