Which criterion is preferred by the router to choose a router ID?

Question:
Which criterion is preferred by the router to choose a router ID?

• the IP address of the highest configured loopback interface on the router
• the IP address of the highest active interface on the router
• the router-id rid command
• the IP address of the highest active OSPF-enabled interface

Explanation: The preferred order of criteria for Cisco routers to identify the router ID is: an explicitly configured router using the router-id rid command; the IP address of any configured loopback interface; and the IP address of any active interface on the router (it does not have to be an OSPF-enabled interface).

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