Microsoft 365 Certified Fundamentals (MS-900) Practice Exam 2026 - Free MS-900 Practice Questions and Study Guide

The correct choice for a company that needs full responsibility for managing operating systems in the cloud is Infrastructure-as-a-Service (IaaS). This service model provides the most control over the computing resources, allowing organizations to deploy and manage their own operating systems, applications, and storage. With IaaS, users can rent virtual servers and have direct access to the underlying infrastructure, enabling them to customize their environment according to specific needs.

In an IaaS setup, the cloud provider manages the physical hardware and networking while the customer is responsible for everything above that layer, including the operating system, middleware, and applications. This level of control is crucial for organizations that require specific configurations or need to meet regulatory compliance standards, as it allows for tailored security and management practices.

Other service models, such as Platform-as-a-Service (PaaS) and Software-as-a-Service (SaaS), do not offer the same degree of control. PaaS provides a platform for developers to build applications but abstracts away the operating system management from the customers. SaaS, on the other hand, delivers fully managed software applications, with the provider taking care of all aspects, including the underlying operating systems, which limits the user’s control over infrastructure configurations. Function-as-a