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Three of the following are billed by resources reserved. Which is the odd one out?

  • A.a virtual machine running on continuously
  • B.a provisioned database instance
  • C.a reserved block storage volume
  • D.a function invoked a thousand times a day

Answer: D

Correct answer: a function invoked a thousand times a day

A function is billed for the time it actually runs, so a thousand short invocations cost a fraction of a second of compute each and nothing at all in between. The other three are billed for resources held whether used or not - a running virtual machine, a provisioned database instance and a reserved volume all accrue charges while idle.

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