How may US Customs enforce export compliance regulations at an airport?

US Customs has the authority to enforce export compliance regulations in various ways to ensure that shipments conform to legal requirements. The option describing the detention of a shipment for export and the unloading of a shipment for inspection accurately reflects the proactive measures Customs can take. This includes the ability to physically inspect cargo, verify documentation, and ensure compliance with U.S. export laws and regulations.

This enforcement mechanism is crucial for maintaining national security, preventing illegal exports of controlled technologies or materials, and ensuring that shipments comply with various international trade laws. The ability to detain and inspect shipments at airports helps Customs identify potential violations or suspicious activities before they can leave the country, thereby protecting U.S. interests and international trade integrity.

Other methods, while relevant to compliance enforcement, do not fully encapsulate the direct authority and actions that Customs can take at the airport to ensure that only compliant shipments are allowed to proceed.