Refer to the exhibit. What additional configuration is required in order for users in VLAN 10 to communicate with the users in VLAN 20?

- Configure interface Fa0/1 on SW1 as a trunk.
- Remove the subinterfaces on R1 and configure interface Fa0/0 as a trunk.
- Configure interfaces Fa0/2 and Fa0/3 on SW1 as trunk links.
- Configure VLAN 100 as a data VLAN and VLAN 1 as the native VLAN.
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