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Which statement best describes an Open Shortest Path First (OSPF) virtual link? A. It designates the network’s backbone area.
B. It designates a physical connection between area border routers (ABR).
C. It connects area border routers (ABR) over a nonbackbone area.
D. It is associated with a specific physical link.
The correct answer is C. It connects area border routers (ABR) over a nonbackbone area.
### Explanation:
In OSPF, a virtual link is used to connect two area border routers (ABRs) that are in different areas but need to communicate through a nonbackbone area. This allows for the extension of the OSPF backbone area (Area 0) across areas that are not directly connected to the backbone, ensuring proper routing within the network.