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单选题
Select a key benefit of DSL.()
A

TCP packet sizes can be optimized by the router so there is no IPSec or AAL5 padding.

B

The local loop is a dedicated connection for a single subscriber to the DSLAM. 

C

Access to the WAN media uses a poll/response mechanism so no two subscribers transmit at the same time. 

D

There are no distance requirements from the Central Office (CO). 


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