A switch is attached to router R1 on its gig 0/0 interface. Fort security reasons, you want to prevent R1 from sending OSPF hellos to the switch. Which command should be enabled to accomplish this?

`ip ospf hello disable` is not a valid or recognized Cisco IOS OSPF command to disable hello packets.

Setting `ip ospf hello-interval 0` is not a valid or functional command to disable hello packets; an interval of 0 is typically rejected or leads to unexpected behavior.

While `passive-interface Gig 0/0` is the correct command, it must be configured within the OSPF router configuration mode (`config-router`), not global configuration mode (`config`).

The command `passive-interface Gig 0/0` entered within OSPF router configuration mode (`config-router`) prevents OSPF hello packets from being sent out on the specified interface (Gig 0/0). This stops OSPF adjacency formation on that segment but still allows the directly connected network to be advertised into the OSPF domain, which is suitable for connecting to a switch where OSPF peering is not needed.