Which two actions improve the stability of this design?

An engineer is designing an OSPF network with multiple nonbackbone areas connecled to the backbone area via a hub-and-spoke topology. Each hub-and-spoke area has a large number of spoke routers connected to the hub that is functioning as an ABR to provide better segmentation.

Which two actions improve the stability of this design? (Choose two.)
A . Configure hub-and-spoke areas as stub.
B . Use External Type 2 metric: across the OSPF domain.
C . Configure hub-and-spake areas as totally stubby.
D . Implement summarization on the ABR routers of hub-and-spoke areas
E . Implement summarization on the ASBR routers in the backbone area

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Answer: CD