"Which three elements must be used when you configure a router interface for VLAN trunking? 1. one physical interface for each subinterface 2. one IP network or subnetwork for each subinterface 3. a management domain for each subinterface 4. subinterface encapsulation identifiers that match VLAN tags 5. one subinterface per VLAN 6. subinterface numbering that matches VLAN tags"