Discussion
Which purpose does the seed and key exchange serve?
Answer: B
The unit issues a challenge and the tool must return the correct response derived from a shared algorithm. The last option explains exactly why, which makes it a correct and more instructive version. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Most errors here come from carrying a result across from a neighbouring case where it does not hold.
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