'Project Loon', sometimes seen in the news, is related to

Project Loon is a wireless communication technology developed by Google (Alphabet) that uses high-altitude balloons in the stratosphere to provide internet connectivity to remote and rural areas. While the balloons utilize solar panels for energy, option (c) is incorrect because solar power is merely the auxiliary power source rather than the primary technological objective. The core concept being tested is the application of emerging technologies in telecommunications and global connectivity.