Which OSPF LSA type does an ASBR use to originate a default route into an area？ （）

A. They are used to summarize area routes to other areas.
B. They are used in not-so-stubby areas to propagate external routes.
C. They are used to notify areas of the ASBR.
D. They are flooded to all areas except stub areas （external route）.

A.00000
B.12345
C.23456
D.65000
E.99999