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

Regarding the description of configuring the security level of the firewall security zone, which of the following statements is correct?
A . For the newly created security zone, the system default security level is 1.
B . The security level can only be set for customized security zones.
C . In the same system, two security zones are not allowed to configure the same security level.
D . Security level – once set, no changes are allowed

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Answer: A