Which type of entity can the commissioner subpoena during an investigation?

The correct choice indicates that the commissioner has the authority to subpoena insurance support organizations during an investigation. This is significant because insurance support organizations play a critical role in the insurance industry. They collect and disseminate information about consumers that insurers use to make underwriting and claims decisions.

The ability to issue subpoenas to these organizations is essential for ensuring transparency and accountability within the insurance market. By having access to the data and practices of these organizations, the commissioner can investigate potential issues such as discrimination, fraud, and unfair practices, which helps to protect consumers and uphold the integrity of the insurance system.

In contrast, the other types of entities listed in the choices—insurance companies, agents, and brokers—may also be relevant in specific contexts, but the breadth of authority granted to the commissioner specifically emphasizes the role of insurance support organizations. This indicates a focus on the broader network of entities that influence the behavior of insurers and their interactions with consumers.