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Question :-

A customer requires high availability, so the network architect is planning two area border (ABRs) for each non-backbone area in the Open Shortest Path First (OSPF) solution. What ensures a loop-free routing environment that meets the customer needs?
All ABRs have at least one interface in area 0, and that interface has an IP address that is outside of the range of any summaries for area 0
Each ABR in an area advertises the same summary routes for the area, and each ABR has a null route that matches those summaries
Only one ABR advertise a summary route for each area. For areas with multiple ABRs, each area can include two summaries ranges, and each ABR is configured with one of those ranges
All ABRs in an area apply consistent path costs for their summary routes

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