Final answer:
To restrict administrators to specific regions for resource creation, Azure Policies should be used.
Step-by-step explanation:
To restrict administrators to specific regions for resource creation, you should use Azure Policies. Azure Policies allow you to define and enforce rules and regulations for resources within Azure. You can create policies that limit resource creation to specific regions, ensuring that administrators can only create resources in the designated regions. This can help with compliance and governance requirements, as well as ensuring proper resource management.