You are running OSPF on a router. One of the interfaces, Gi0/1, connects to your ISP. You want to make sure you do not forward any OSPF packets to your ISP. How can you achieve this?

The command passive-interface gigabitethernet 0/1 must be configured under the router process. This command will suppress hello packets from exiting the Gi0/1 interface. The command passive-interface is incorrect when it is configured inside an interface. The command passive-interface gigabitethernet 0/1 is incorrect when it is configured in global configuration mode. The command passive-interface default is also incorrect.