The correct answer is option 1: Geneva. The International Organization for Standardisation (ISO) is headquartered in Geneva, Switzerland. Geneva is a global hub for international organizations, and the ISO chose to establish its headquarters there to have easy access to the United Nations, the World Health Organization, and other important international bodies. By being based in Geneva, the ISO is able to collaborate and coordinate with these organizations effectively. It is important to note that the ISO is an independent, non-governmental organization that develops and publishes international standards. These standards cover various aspects such as technology, safety, quality, and environmental sustainability. They are implemented by businesses and organizations worldwide to improve efficiency, increase compatibility, and ensure consistency across different industries and sectors. Overall, Geneva serves as a strategic location for the ISO to carry out its mission of facilitating international standardization.