Referring to the network illustrated in the exhibit, how does router A reach destinations in area 49.2222?

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Referring to the network illustrated in the exhibit, how does router A reach destinations in area 49.2222?
A . Router A will use the routes from area 49.2222; it learns from router B
B . Router A will see the attached bit from router B and create a default route
C . Router A must have a default route manually configured
D . Router A will receive a default route in the IS-IS update from router B

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Answer: B