Final answer:
The Public Cloud model does not require CapEx as the infrastructure is owned by third-party providers and clients pay for usage, making it operational expenditure.
Step-by-step explanation:
The cloud model that requires no Capital Expenditure (CapEx) is the Public Cloud. CapEx refers to the upfront investment in physical hardware and infrastructure, which is not required in the public cloud model, as resources are provided by a third-party over the internet. Instead, clients usually pay for services through Operational Expenditure (OpEx) which involves regular payments based on usage. Examples of public cloud providers include Amazon Web Services (AWS), Goo-gle Cloud Platform (GCP), and Microsoft Azure.