Which two statements are true?

An OSPF network has been designed with multiple areas to improve scalability.

Which two statements are true? (Choose two.)
A . Each router in the OSPF network runs the shortest-path-first algorithm to determine paths through the network.
B . The Area Border Router for each area runs the shortest-path-first algorithm and floods its results through the area.
C . Each area must have at least one link connecting it to each of the other areas of the OSPF network.
D . OSPF provides loop-free routing within an OSPF routing domain, but does not guarantee symmetrical routing.

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Answer: A,D