what happens if an attacker attempts a double-tagging attack?

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.