Refer to the exhibit. Router R2 has recently been configured and connected via interface Gigabit Ethernet 0/0 to router R1. R1 is configured correctly, but fails to establish a neighbor relationship with R2. What is the problem?
- The EIGRPv6 process has not been activated on interface Gigabit Ethernet 0/0.
- The passive-interface command is preventing hello packets from being sent.
- The command ipv6 unicast-routing should be implemented in the router configuration mode.
- The command ipv6 unicast-routing has not been implemented.
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