Ha! This question is a real brain-teaser. I'm leaning towards D) Line units, but I wouldn't be surprised if the answer is 'none of the above' and the correct response is actually 'the magic pixies who live in the telephone wires'.
Hmm, I'm not so sure about that. The line units seem to be the correct answer, but I'm also considering C) Tributary units. They could be responsible for the serial data too.
I think the answer is D) Line units. The orderwire phone is part of the interface and system, so the line units would be the functional unit providing the serial data.
Paola
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