Which of the following scenarios may lead to the unknown state of the VM?

If the status of a VM is unknown, the management system cannot identify the actual status of the VM.

Which of the following scenarios may lead to the unknown state of the VM? (Multiple Choice)
A . The virtualization type of the availability zone (AZ) where the VM is located is VMware.
B . The network of the VM host is disconnected from the management system, but the VM is running properly.
C . The nova-compute service in the OpenStack is abnormal
D . The VM host is powered off, and the VM cannot work properly.

Answer: BC