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AWS Certified Solutions Architect study material · question 397 of 500

What is a Spot capacity pool?

  1. The set of Spot requests an account has outstanding
  2. A reserved block of Spot capacity bought in advance
  3. The pool of instances an Auto Scaling group may launch
  4. The unused EC2 instances of one instance type in one Availability Zone
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Answer: D. The unused EC2 instances of one instance type in one Availability Zone

A capacity pool is defined by instance type and Availability Zone together, which is why diversifying across both improves Spot availability.

Source: Spot Instances (Amazon Web Services) — Concepts

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