Which two statements describe the hierarchical LAN design model? (Choose two)

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Which two statements describe the hierarchical LAN design model? (Choose two)
A . It is a well-understood architecture that provides scalability
B. It is the best design for modern data centers
C. It is the most optimal design but is highly complex
D. It provides a simplified design
E. Changes, upgrades, and new services can be introduced in a controlled and stagged manner

Answer: A,E