The first two possibilities that you suggest don't answer "Why?", they answer "How?" They both describe a mechanism by which the outcome is obtained and AFAIK, describing what my engine did when I drove myself to the shops comes nowhere near explaining why I went there in the first place.
The third possibility, by its very nature, precludes any answer, since there can be no way of knowing what particular outcome is desired by the IDer, let alone why that outcome is desired. Even if we could find out the "Whys?" would continue
ad infinitum, basically "It's turtles all the way down".
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