All three statements about green hydrogen are correct, and they reflect its versatile applications in energy systems. First, green hydrogen can indeed be used directly as a fuel for internal combustion engines, although some modifications may be needed. Second, it can be blended with natural gas to enhance sustainability in heating and power generation, leveraging existing infrastructure. Lastly, hydrogen fuel cells convert hydrogen into electricity, enabling zero-emission vehicles. Understanding these applications emphasizes green hydrogen's potential role in achieving energy transition and reducing carbon footprints, aligning with India's commitment to sustainable development as per global climate agreements.