Your network contains two Hyper-V hosts named Host1 and Host2. Host1 contains a virtual machine named
VM1. Host2 contains a virtual machine named VM2. VM1 and VM2 run Windows Server 2012 R2.
You install the Network Load Balancing feature on VM1 and VM2.
You need to ensure that the virtual machines are configured to support Network Load Balancing (NLB).
Which virtual machine settings should you configure on VM1 and VM2?

A.
DHCP guard

B.
MAC address

C.
Router guard

D.
Port mirroring

Explanation:
When MAC addresses are not assigned to virtual machines, it could cause network problems.

Training Guide: Installing and Configuring Windows Server 2012 R2: Chapter 7: Hyper-V virtualization, Lesson
1: Deploying and configuring Hyper-V hosts, p. 313-319.
http://blogs.msdn.com/b/clustering/archive/2010/07/01/10033544.aspx