Comprehensive and Detailed Explanation From Exact Extract:
FromNokia 7750 SR OS OSPF Guide — Area Border Routers (ABRs) Section:
“An ABR is a router connected to both area 0 and at least one non-backbone area, responsible for exchanging routing information between areas.”
ABRs serve as gateways between the backbone area (area 0) and non-backbone areas.
Summarization is optional on ABRs, not mandatory.
Thus, the correct answer is C.
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