[BSCI] ABR or ASBR ?

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I'm preparing myself for the BSCI exam and I'm not sure the answer is
correct: http://tinyurl.com/5wfd6q

Is the an answer B (OSPF router 5.0.0.2 is an ABR) really the correct
one? Is 5.0.0.2 ABR or ASBR? I'm a bit confused because the route O*N2
is generated by ASBR, but I'm not sure does ASBR has to be connected
to NSSA or not. Or only O N2 (without an asterisk) routes are
generated by ASBRs? I would say that answer C (The default route is
learned from an OSPF neighbor), but correct me if I'm wrong.

Thanks!

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