Which statement about data center access layer design modes is correct?

Which statement about data center access layer design modes is correct?
A . The access layer is the first oversubscription point in a data center design.
B . The data center access layer provides the physical-level connections to the server resources and only operates at Layer 3.
C . When using a Layer 2 looped design, VLANs are not extended into the aggregation layer.
D . When using a Layer 3 design, stateful services requiring Layer 2 connectivity are provisioned from the aggregation layer.

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Answer: A