Which registry only allows citizens of the state to be registered owners?

The correct answer is the closed registry, which is designed to restrict ownership to citizens or entities of the country under which the vessels are registered. This system prioritizes national interests and ensures that only local stakeholders can own and operate vessels registered in that particular jurisdiction. The primary motivation behind closed registries often includes promoting national maritime industries, enhancing safety standards, and ensuring compliance with domestic laws.

In contrast, the open registry allows for foreign ownership and is typically more accessible for international shipping companies, which may prioritize factors such as lower taxes and fewer regulatory requirements. The hybrid registry combines elements of both but does not exclusively limit registration to citizens. The international registry, on the other hand, accommodates vessels regardless of the owner's nationality but does not restrict ownership solely to citizens of the registering state.