Which two of these Metro Internet services map to E-LAN services that are defined by the MEF？（）

A. Ethernet Private Line
B. Ethernet Wire Service
C. Ethernet Relay Service
D. Ethernet Multipoint Service
E. Ethernet Relay Multipoint Service

A. NAC can authenticate using 802.1X and IBNS cannot
B. NAC can ensure only compliant machines connect and IBNS cannot
C. NAC can ensure access to the correct network resources and IBNS cannot
D. NAC can manage user mobility and reduce overhead costs and IBNS cannot

A. Layer 2
B. Layer 3
C. in-band
D. out-of-band
E. edge
F. central