Which of the following statements about the access network is correct is  _____

Which of the following statements about the access network is correct is  _____
A . access into generally refers to the connection between the user and the network operator of the network close to the user central office
B . Compared with backbone network, access network is often the bottleneck of network transmission speed
C . access network typically includes a user transmission system, terminal multiplexers or network,
D . The  access network can also be Ethernet

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Answer:   ABCD