Which of the following is a recommended practice of a data center core?

A.
Server-to-server traffic always remains in the core layer

B.
The core infrastructure should be in Layer 3.

C.
Core layer should run BGP along with an IGP because iBGP has a lower administrative distance than any IGP

D.
The Cisco Express Forwarding hashing algorithm is the default, based on the IP address and Layer 4 port