The ADSL user under the UA5000 originally used the active template as 2M. After the active template was modified to 4M, the speed remained at the original level. There was no obvious improvement. What could be the cause of the problem?

The ADSL user under the UA5000 originally used the active template as 2M. After the active template was modified to 4M, the speed remained at the original level. There was no obvious improvement. What could be the cause of the problem?
A . There is congestion at the uplink port
B . ADSL port quality is poor
C . The depth of interweaving of the activation template is too deep
D . Above are possible

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Answer: D