While you are waiting for G.G. to respond, I would like to toss in my two cents. As written in your first post, none of them are correct, as pointed out by G.G. Some of your questions really had me stumped. because I never think about

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Those are different situations, in my experience. "How do you ... greeting situation is assymmetric. One party says "How are you?" The reader should understand that unless the question above is asked by a doctor, that no one wants

Nowadays I hear the expression "I'm good" used in conversation: ... greeting. How old and how widespread are these usages? I first (2) in about 1989, out of the mouth of an American exchange student in France. A friend of ... an