If you change the native VLAN on the trunk port to an unused VLAN, what happens if an attacker attempts a double-tagging attack?

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If you change the native VLAN on the trunk port to an unused VLAN, what happens if an attacker attempts a double-tagging attack?
A . The trunk port would go into an error-disabled state.
B . A VLAN hopping attack would be successful.
C . A VLAN hopping attack would be prevented.
D . The attacked VLAN will be pruned.

Answer: C