Which one is not a layer of cloud computing?

Which one is not a layer of cloud computing?

  1. a) Computing as a service (CaaS)
  2. b) Infrastructure as a service (IaaS)
  3. c) Platform as a service (PaaS)
  4. d) Software as a service (SaaS)

From the Combined Bank Assistant Engineer (IT) 2020 – Preliminary exam, question 36 of 37.

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