Which two statements about the data Center Aggregation layer are correct? (Choose two)

A.
Layer 4 through layer 7 services are provided in that layer

B.
STP should never be supported in that layer

C.
That layer is the critical point for control and application services

D.
Layer 2 connectivity is provided in that layer from the data center to the core

Explanation:
Data Center aggregation layer connects various network modules together. Link: http://www.cisco.com/en/US/docs/solutions/Enterprise/Campus/campover.html