单选题Which one of these statements is true of OSPF type 5 LSAs？（）AThey are used to summarize area routes to other areas.BThey are used in not-so-stubby areas to propagate external routes.CThey are used to notify areas of the ASBR.DThey are flooded to all areas except stub areas （external route）.
单选题
Which one of these statements is true of OSPF type 5 LSAs？（）
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）.
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