OSPF stub areas are an important tool for the Network designer; which of the following two should be considered when utilizing OSPF stub areas? (Choose two)

OSPF stub areas are an important tool for the Network designer; which of the following two should be considered when utilizing OSPF stub areas? (Choose two)

A.
OSPF stub areas increase the size of the LSDB with the addition of Type 3 and 5 LSAs

B.
OSPF not so stubby areas are particularly useful as a simpler form of summarization

C.
OSPF stub areas are always insulated from external changes

D.
OSPF stub areas can distinguish among ASBRs for destinations that are external to the OSPF domain

E.
OSPF totally stubby areas cannot distinguish among ABRs for the best route to destinations outside the area

Explanation: