A subscriber’s DSL service was not working correctly. The subscriber discovered that a DSL microfilter was accidentally installed between the DSL modem and telephone line instead of between the telephone and telephone line. What was the symptom observed by the subscriber?

A.
The modem would train up, but only when the telephone was off-hook (conversation in progress).

B.
DSL service was normal, but the telephone on the same line would not work.

C.
DSL service was normal, but there was excessive noise heard during telephone conversations.

D.
The DSL modem would either not train up, or it trained at very low DSL rates. The modem would not train up when the telephone was off-hook.