Two virtual machines belonging to the same network segment in the same host cannot communicate with each other. Which of the following is not a possible cause of the failure?

Two virtual machines belonging to the same network segment in the same host cannot communicate with each other. Which of the following is not a possible cause of the failure?
A . The network card of the virtual machine is faulty
B. Virtual machine firewalls deny access to each other
C. Virtual machines are isolated through security groups
D. Two virtual machine NICs join the same port group

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Answer: D