You have a Lync Server 2013 infrastructure.
Your company has a sales department and a research department.
You deploy persistent chat.
You need to configure persistent chat to meet the following requirements:
Users in the sales department must be prevented from viewing the names of the rooms used by the research department.
Users in the research department must be able to discover all of the rooms used by their department.
What should you do?

A.
· Create a user-level Persistent Chat Policy named Sales.
· Apply the Sales policy to the sales and research users.
· Create persistent chat rooms for each department and set the privacy to Secret.

B.
· Create a category named ResearchRooms.
· Add the research users as Allowed members to the ResearchRooms category.
· Add the sales users as Denied members to the ResearchRooms category.
· Create persistent chat rooms for each department and set the privacy to Closed.

C.
· Create a category named ResearchRooms.
· Add the research users as Allowed members to the ResearchRooms category.
· Add the sales users as Denied members to the ResearchRooms category.
· Create persistent chat rooms for each department and set the privacy to Secret.

D.
· Create a user-level Persistent Chat Policy named Sales.
· Apply the Sales policy to the sales and research users.
· Create persistent chat rooms for each department and set the privacy to Open.

Explanation:
http://technet.microsoft.com/en-us/library/jj204859.aspx http://technet.microsoft.com/en-us/library/jj205166.aspx