Your network has Lync Server 2010 deployed.
You need to modify the Lync Server 2010 infrastructure to meet the following requirements:

+ Users must be prevented from creating conferences that have more than 20 invitees.
+ Department managers must be able to create conferences that have as many as 300 invitees.

What should you do?

A.
Modify the Global Conferencing Policy and create a User Conferencing Policy.

B.
Modify the Global Conferencing Policy and create a Site Conferencing Policy.

C.
Modify the Global Meeting Configuration settings and create a new collection of Pool Meeting Configuration settings.

D.
Modify the Global Meeting Configuration settings and create a new collection of Site Meeting Configuration settings.

Explanation:
http://technet.microsoft.com/en-us/library/gg429715.aspx