What are three key design principles when using a classic hierarchical network model? (Choose three.)

What are three key design principles when using a classic hierarchical network model? (Choose three.)
A . The core layer controls access to resources for security.
B . The core layer should be configured with minimal complexity.
C . The core layer is designed first, followed by the distribution layer and then the access layer.
D . A hierarchical network design model aids fault isolation.
E . The core layer provides server access in a small campus.
F . A hierarchical network design facilitates changes.

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Answer: B,D,F