Three of the following statements are correct. Identify the three (3) correct statements.

A.
As ADSL rates are manually reduced by changing the DSL profile in the DSLAM, signal-to-noise margins improve.

B.
As cable length increases, actual noise margins degrade (less margin) for the same DSL rate.

C.
Low actual noise margins can cause lower than desired trained rates and unreliable DSL service.

D.
Higher ATM and IP data rates cause lower DSL margins. For higher ATM and IP data rates, the noise margin options must be set higher in the DSL profiles.