Which Cisco IOS show command is used to display the VLAN configuration (including native VLAN configuration) of a router?

A) show vlan
B) show ip roas
C) show vlans
D) show interfaces

C
Explanation: C) The Cisco IOS show vlans command is used to display the Router On a Stick (ROAS) configuration of a router, including which interface is configured with the native VLAN.