What is the correct description of an Area Border Router (ABR)?
A. An ABR is an OSPF router with links in two areas, connecting OSPF areas to the backbone
B. An ABR is an OSPF router that injects routing information from outside the OSPF AS
C. An ABR is an OSPF router with at least one link in a Layer 2 area
D. An ABR is an OSPF router with all of its links within an area
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