What could be the cause of this error?

An administrator is performing validation testing of a new-deploy cluster. During this test, the administrator disconnect each LAN interface from each of the nodes while pinging the hypervisor and guest VMs.

When the first interface is disconnected, pings continue as expected to the hypervisor, but pings stop responding from the guest. Pings continue when the interface is reconnected. When the second interface is disconnected, pings continue to both the hypervisor and guest VMs.

What could be the cause of this error?
A . This is normal behavior for a LAN Failover
B. Switch ports are configured with different VLANs
C. Portfast is not enabled on the switch ports
D. One of the network interfaces has a bad patch cable.

Answer: B