单项选择题

What will significantly degrade DSL performance， regardless of DSL rate or line length？（）

A.Microliters installed between a telephone and shared line
B.POTS splitters at the subscriber’s end of the DSL line
C.POTS splitters at the telco CO
D.None of the other alternatives apply

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What will significantly degrade DSL performance， regardless of DSL rate or line length？ （）

What will significantly degrade DSL performance， regardless of DSL rate or line length？（）