When would a license server be configured for vCenter Server 5.x?

A.
When managing ESX 3.x servers

B.
When the vCenter Server Virtual Appliance (vCSA) is used

C.
Within the first 60 days

D.
A standalone license server is installed by default

Explanation:
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=display
KC&externalId=1010704