Which of the following is a Global Navigation Satellite System (GNSS)?

Galileo is a Global Navigation Satellite System (GNSS) developed by the European Union and the European Space Agency. It operates independently of other GNSS systems like the United States' GPS, Russia's GLONASS, and China's BeiDou. Galileo provides precise positioning and timing information to users worldwide, enhancing navigation capabilities for a wide range of applications, including aviation, maritime, and personal navigation devices.

In contrast, the other options represent different types of navigation systems. VOR (VHF Omni-directional Range) is a radio navigation system for aircraft that enables them to determine their position relative to a network of ground-based transmitters. DME (Distance Measuring Equipment) is used in aviation to measure the distance between an aircraft and a ground station. LORAN (Long Range Navigation) is a terrestrial radio navigation system that has been largely replaced by satellite systems but was used for maritime and airborne navigation. These systems do not fall under the category of GNSS, as they rely on ground-based signals rather than satellite-based signals.