Right answer in IS-IS, routing between areas is organized hierarchically. This organization is accomplished by configuring Level 1 and Level 2 intermediate systems. Level 1 systems route within an area. When the destination is outside an area, Level 1 systems route toward a Level 2 system. Level 2 intermediate systems route between areas and toward other ASs. No IS-IS area functions strictly as a backbone.
https://www.juniper.net/documentation/us/en/software/junos/is-is/topics/concept/isis-levels-understanding.html
Looks like the right answer based on https://www.juniper.net/documentation/us/en/software/junos/is-is/topics/example/routing-protocol-is-is-security-configuring-cli.html
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