The OS layer is hidden from PaaS consumers and also from:
ASaaS carriers
BSaaS captors
CSaaS collectors
DSaaS consumers
Answer & Solution
Correct answer: D. SaaS consumers
1. Visibility of each layer depends on the service model.
2. The higher the model, the less is exposed.
3. The OS layer includes operating system and drivers and is hidden from SaaS and PaaS consumers.
4. So the answer is SaaS consumers.
_Source: NIST SP 500-292, 'NIST Cloud Computing Reference Architecture'_
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