Which of the descriptions of the virtual system is incorrect?

Which of the descriptions of the virtual system is incorrect?
A . There are two types of virtual systems on the NGFW: root system and virtual system.
B . A special virtual system that exists by default on the NGFW is called the root system.
C . The logical devices that are divided and run independently on the NGFW are called virtual systems.
D . If the virtual system function is not enabled, the root system does not exist.

Answer: D