Which three components does a data center network layer have?

Which three components does a data center network layer have? (Choose three.)
A. Cisco GSR
B. Cisco CRS – 1
C. Cisco Nexus 7000
D. Cisco Nexus 1000V
E. Cisco Nexus 2000
F. Cisco ASR 9000
G. Cisco Nexus 5000