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

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

A. Migration between virtual appliances 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 physical 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.