What ensures a loop-free routing environment that meets the customer needs?

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?
A . 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
B . Each ABR in an area advertises the same summary routes for the area, and each ABR has a null route that matches those summaries
C . 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
D . All ABRs in an area apply consistent path costs for their summary routes

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Answer: C