Haha, I'm just glad they didn't include an option like 'A) Summon a herd of unicorns to solve the problem'. That would have been a real head-scratcher!
D seems like the obvious choice here. ERDs are all about identifying the 'who' and 'what' of a process, and how they interact. I'm not even sure why the other options are in there.
Hmm, I was leaning towards option B, as ERDs can also show the transformations that occur in a process. But I guess D is a better fit for the overall purpose of an ERD.
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