What are the benefits of a 3-Tier design over a 2-Tier?

What are the benefits of a 3-Tier design over a 2-Tier? (Choose two.)
A. Offloading processing from the Core without routing at the Access layer.
B. Can use lower speed links between Core to Aggregation and Aggregation to Access given the use of an Aggregation layer.
C. Lowering the cost of a deployment due to needing less switches overall.
D. Better scalability in a campus with a large number of buildings.
E. Gaining the flexibility to connect the Data-Center to any Access layer switch.

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