Discussion
Which protocol carries diagnostic requests over a controller area network?
Answer: C
Unified diagnostic services provides reading, writing, routines and programming over a transport protocol. The last option describes exactly that, which makes it a correct and more descriptive version of the same answer. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Most errors here come from carrying a result across from a neighbouring case where it does not hold.
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