Which three items represent features of Cisco Virtual Switching System?

Which three items represent features of Cisco Virtual Switching System? (choose three)

A.
Single control plane

B.
Dual control planes

C.
VSS appears as one switch to downstream switches

D.
VSS appears as two switches to downstream switch

E.
Etherchannel protocols include Static, LACP

F.
channel protocols include Static, PAgP, PAgP+, LACP