Which three choices are BGP Extended communities used in MPLS-VPN deployment？（）

A.router（config）#
B.router（config-if）#
C.router（config-vrf）#
D.router（config-router）#
E.router（config-router-af）#

A.EtherChannel technology helps aggregate traffic grouping multiple，full-duplex point-to-point linkstogether
B.EtherChannel technology is based on the 802.1 IEEE stand
C.EtherChannel can aggregate up to 800 Mbps，8 Gbps，or Gbps of aggregate bandwidth for a Fast EtherChannel，Gigabit EtherChannel，or 10 Gigabit EtherChannel connection respectively
D.EtherChannel is defined for Rapid Spanning Tree for faster convergence

A.Uniform model
B.Pipe Model
C.Short Pipe
D.None of the above will alter Differentiated Services（Diff-Serv）code points set in different DifferentiatedServices（Diff-Serv）domain