What is difference between a Cisco Content Security Management virtual appliance and a physical appliance?

What is difference between a Cisco Content Security Management virtual appliance and a physical appliance?
A . Migration between virtual appliance of varying sizes is possible, but physical appliances must be of equal size.
B . The virtual appliance requires an additional license to run on a host.
C . The virtual appliance requires an additional license to activate its adapters.
D . The physical appliance is configured with a DHCP-enabled management port to receive an IP Address automatically, but you must assign the virtual appliance an IP address manually in your management subnet.

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Answer: B