What are two characteristics of OSPF ABRs? (Choose two.)

What are two characteristics of OSPF ABRs? (Choose two.)
A . ABRs transmit routing information between the backbone and other areas.
B . ABRs cannot be part of the backbone and another area at the same time.
C . ABRs inject routing information from outside the OSPF domain.
D . ABRs link two OSPF areas.

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Answer: AD