What are two prerequisites for installing vCenter Server?

What are two prerequisites for installing vCenter Server? (Choose two )

A.
The system vCenter Server is installed on must be a virtual machine.

B.
The computer name must be an appropriate length

C.
There must be no network address translation (NAT) between the vCenter Server system and the ES3G hosts.

D.
The system vCenter Server is installed on must be a domain controller

Explanation:
A: Wrong, can be a physical machine
D: Wrong, vCenter cannot be installed on a domain controller.
Source: http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&extern alId=2003790
(Topic: Environmental prerequisites, 6th bulleted point)