Discussion
Spot or preemptible capacity is cheaper because
Answer: D
Correct answer: the provider may reclaim it at short notice
Spot instances are the provider’s unused capacity, sold at a steep discount because it can be withdrawn - typically with a warning of a couple of minutes - whenever a full-price customer wants it. The hardware is the same as any other instance; what differs is the guarantee, and the discount is payment for accepting that interruption.
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