You have a System Center 2012 Virtual Machine Manager (VMM) infrastructure that contains one virtualization host named Server1.
You configure a logical network named Network1 that contains a network site named Site1.
DHCP allocates IP addresses on the network.
You configure the logical network as shown in the exhibit.
(Click the Exhibit button.)
You need to ensure that the virtual machines on VLAN 1 are assigned IP addresses from DHCP only.
What should you do?
Exhibit:

A.
From the Network Site properties, remove the subnet assignment.

B.
From Windows Firewall on Server1, create an inbound rule.

C.
From the Network Site properties, remove the VLAN assignment.

D.
From the logical network configuration, remove the network site.

Explanation:
http://technet.microsoft.com/en-us/library/gg610596.aspx
If you want to use DHCP that is already available on the network to assign IP addresses to virtual devices in a specified VLAN, create network sites with only VLANs
assigned.