Refer to the exhibit. A network administrator is configuring EIGRP AS 20 on Router_2 and has received the error that is shown. What is the cause of the error?

- The autonomous system (AS) number is not the same as the number on other routers in this network.
- The EIGRPv6 interface configuration is incomplete.
- The passive-interface default command has been implemented for EIGRPv6.
- The IPv6 routing process cannot be implemented until IPv6 routing is enabled.
Explanation: The EIGRPv6 configuration is causing an error because the command ipv6 unicast-routing has not been implemented yet in global configuration mode. This command enables IPv6 routing on the Cisco router. Without this command, no IPv6 protocols will be enabled.
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