Which two devices operate only at OSI Layer 2?

Which two devices operate only at OSI Layer 2? (Choose two.)

A.
Cisco Nexus 7010

B.
Cisco Nexus 5548

C.
Cisco Nexus 5596

D.
Cisco Nexus 5020

E.
Cisco Nexus 3016

F.
Cisco Nexus 2248