Which of the following structures passes through the opening labeled 3 in the diagram? 
Definitions:
GPS System
A global navigation satellite system that provides geolocation and time information to a GPS receiver anywhere on or near the Earth.
Australia
A country in the Southern Hemisphere, comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands, known for its unique biodiversity and vibrant culture.
China
A country located in East Asia, known for being the world's most populous nation and for its significant cultural and economic influence.
European Union
A political and economic union of 27 European countries that are located primarily in Europe, aimed at facilitating free trade and common policies.
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