Which infrastructure model requires a company to purchase and maintain all of its own servers?

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This question tests who owns and maintains the hardware in different infrastructure models. In a private infrastructure, the company owns and operates its own servers—purchasing the hardware and handling maintenance, upgrades, and day-to-day operations. This setup gives the organization full control over security, compliance, and configuration, but it also requires substantial upfront capital and ongoing maintenance.

Public cloud models, by contrast, are owned and operated by a service provider, with the company paying for resources rather than owning servers. A hybrid combines private and public elements, using both approaches for different workloads. Since the company in this scenario is responsible for buying and maintaining all its servers, the correct choice is private infrastructure.