I believe the question is not complete (as most Systems Design questions are :) ). Is it on a request thread or a background thread? Exponential back-off on a request thread may lead to an overly long customer wait, or (worse yet) broken connection. I'd therefore restrict myself to 1 and 4.
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Expected answer 1, 4 and 5. What do others think. I find it acceptable. Although I find this to be a better subjective question than objective question.
- __Joker October 10, 2018