Which description of the role of a VEM on a Cisco Nexus 1000V Series Switch is true?

Which description of the role of a VEM on a Cisco Nexus 1000V Series Switch is true?
A. It switches the data traffic within the hypervisor.
B. It configures the interfaces.
C. It controls the software of the DVS.
D. It conveys the control and packet VLAN IDs.