What is the primary function of a Resource Group in an Azure IoT solution?

The primary function of a Resource Group in an Azure IoT solution is to act as a container to store metadata about related resources. This organization enables better management of resources that share a common lifecycle, such as an IoT solution where various components like IoT Hub, storage accounts, and functions may be deployed together.

By grouping these resources, users can simplify access control, billing, and monitoring, thus ensuring that all the resources related to a specific project or environment can be managed as a single entity. This not only enhances clarity but also streamlines administrative tasks like applying resource policies and controlling access through Azure Role-Based Access Control (RBAC).

Other choices revolve around more specific functionalities that do not capture the broader role of Resource Groups. For instance, a Resource Group is not limited to deploying virtual machines, isolating storage accounts, or just creating security settings for devices. Instead, its role is comprehensive, serving a wider purpose in managing diverse Azure resources effectively.