Why should you configure DHCP relay for Virtual Machine Manager integration?
A. to create VTEP VMK interfaces on each host for the OpFlex control channel
B. to provide IP addresses to ESXi hosts
C. to provide IP addresses to virtual hosts through the VXLAN infrastructure
D. to ensure that virtual hosts have the same address when they are moved by using VMware vMotion
Answer is A:
https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus1000/avs/install-upgrade/5-2-1-SV3-1-5/b_Cisco_AVS_Install_Upgrade_5-2-1-SV3-1-5/b_Cisco_AVS_Install_Upgrade_5-2-1-SV3-2-0_chapter_01.html#task_18B9E96F56564F1FB53845EA296ED693
Configuring a DHCP Relay Policy and Label
You need to create a DHCP relay policy in the infra tenant and a DHCP label on the Cisco Application Policy Infrastructure Controller (APIC). This will allow the Cisco Application Virtual Switch (AVS) to create a Virtual Machine kernel (VM) Virtual Tunnel Endpoint (VTEP) interface on each host. This VTEP interface will be used for the OpenFlex control channel, the virtual extensible LAN (VXLAN) tunnel source between the VTEP and the Cisco Application Centric Infrastructure (ACI) fabric, or both.