Regarding the description of configuring the security level of the security zone of the firewall, which of the following is wrong?

Regarding the description of configuring the security level of the security zone of the firewall, which of the following is wrong?
A .  In the same system, two security zones are not allowed to configure the same security level
B .  Security levels can only be set for custom security areas
C .  Once the security level is set, it is not allowed to change
D .  The newly created security area, the system defaults its security level to 1

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Answer: D