Which three of the following statements correctly describe switching? (Choose three.)
A. A Layer 2 switch operates up to the data linklayer of the OSI network model.
B. A Layer 3 switch operates up to the transportlayer of the OSI network model.
C. A dual-layer switch operates at the transport and data link layers of the OSI network model.
D. A dual-layer switch operates at the data link and network layers of the OSI network model.
E. A multilayer switch operates up to Layer 4 of the OSI network model.
