Your network has Lync Server 2010 deployed. You need to recommend a solution for the companys help desk that meets the following requirements: When users call the help desk, they must be routed to the first available help desk agent. Help desk agents must be able to control whether a help desk call is routed to them. What should you include in the recommendation?

A.
a Response Group configured for formal agent participation

B.
a voice route and a call park

C.
a voice route and a custom dial plan

D.
a Response Group configured for informal agent participation

Explanation:
In the Participation policy, select one of the following to set up the sign-in behavior for the group:
* Select Informal to specify that agents in the group do not need to sign in and out of the group. Agents are automatically signed in to the group when they sign in to Lync Server 2010.
* Select Formal to specify that agents in the group must sign in and out of the group. When you select this option, agents click a menu item in Lync 2010 to open Internet Explorer and display a webpage console for signing in and out of the group.
(http://technet.microsoft.com/ru-ru/library/gg398917(en-us).aspx)