Microsoft Certified: Azure Fundamentals (AZ-900) Practice Exam

The correct answer is that resource groups cannot be nested. In Azure, resource groups serve as containers for resources such as virtual machines, databases, and networking components, facilitating resource management and organization. However, Azure does not allow for the nesting of resource groups; each resource group is a flat structure where resources are directly assigned to a single group.

The other statements accurately reflect features of resource groups. Resources can indeed belong to only one resource group at a time, ensuring clear ownership and management of resources. Additionally, Azure allows for the movement of resources between resource groups, which can be helpful for reorganizing resources as project needs change or for managing billing and access. Finally, role-based access control (RBAC) can be applied at the resource group level, allowing for granular permissions and ensuring that users only have access to the resources they need. This capability is essential for maintaining security and governance within Azure environments.