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