What is the purpose of the "right of visit" under international law?

The "right of visit" under international law allows a state to board a vessel flying a foreign flag to determine its nationality and to verify whether it is engaged in illegal activities. This includes checking the nationality of suspected vessels that might be involved in piracy, trafficking, or violations of international law. The primary intention is to uphold the law and ensure that states can protect their interests and enforce international norms against any potential threats posed by vessels that may not be abiding by maritime laws.

While the other options might seem relevant, they do not capture the full scope and intent of the "right of visit." The right involves checking the nationality of vessels suspected of engaging in unlawful acts, which aligns with maintaining maritime security and order. This function is critical for naval authorities operating in international waters, as it provides a legal basis for intervention when there are reasonable grounds to suspect that a vessel may be involved in criminal activities.