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.