Refer to the exhibit. A network administrator has configured OSPFv2 on the two Cisco routers. The routers are unable to form a neighbor adjacency. What should be done to fix the problem on router R2?

- Implement the command no passive-interface Serial0/1.
- Implement the command network 192.168.2.6 0.0.0.0 area 0 on router R2.
- Change the router-id of router R2 to 2.2.2.2.
- Implement the command network 192.168.3.1 0.0.0.0 area 0 on router R2.
Explanation: OSPF-enabled routers must exchange Hello packets to discover neighbors and establish adjacencies. However, the passive-interface command suppresses these OSPF messages, preventing the router from sending and receiving routing updates on that specific interface. Because the show ip protocols output for R2 indicates that Serial0/1 (the interface connecting it to R1) is configured as a passive interface, R2 is not sending the necessary Hello packets to form an adjacency with R1. Removing this configuration on Serial0/1 will allow OSPF communication to resume on that link.
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