Final answer:
The Cloud model that allows you to have complete control over the operating system is Infrastructure as a Service (IaaS).
Step-by-step explanation:
The Cloud model that allows you to have complete control over the operating system is the Infrastructure as a Service (IaaS) model. With IaaS, you have full control over the operating system, allowing you to install, configure, and manage it as needed. This model is ideal for users who require a high level of flexibility and control over their infrastructure.
For example, Amazon Web Services (AWS) Elastic Compute Cloud (EC2) is an IaaS platform that allows users to create virtual machines and have complete control over the operating system running on those virtual machines.