Which two characteristics describe the access layer of the hierarchical network design model?

Which two characteristics describe the access layer of the hierarchical network design model?
(Choose two.)

A.
layer 3 support

B.
port security

C.
redundant components

D.
VLANs

E.
PoE

Explanation:
http://www.ciscopath.com/content/61/
http://www.mcmcse.com/cisco/guides/hierarchical_model.shtml
Access layer
The main purpose of the access layer is to provide direct connection to devices on the network
and controlling which devices are allowed to communicate over it. The access layer interfaces
with end devices, such as PCs, printers, and IP phones, to provide access to the rest of the
network. The access layer can include routers, switches, bridges, hubs, and wireless access
points (AP).
Switch features in the Access layer:
 Port security
 VLANs
 Fast Ethernet/Gigabit Ethernet
 Power over Ethernet (PoE)
 Link aggregation
 Quality of Service (QoS)