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Which of the following statements regarding area border routers in an OSPF network is true?
Correct Answer: C
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.