Which statement is true concerning the data center distribution (aggregation) layer design?

A.
With Layer 3 at the aggregation layer, the physical loops in the topology must still be managed by
STP.

B.
The boundary between Layer 2 and Layer 3 must reside in the multilayer switches, independent of
any other devices.

C.
A mix of both Layer 2 and Layer 3 access is the most optimal.

D.
In a small data center, the aggregation layer can connect directly to the campus core, exchanging
IP routes and MAC address tables.