Correct Answer - Option 4 : iOS
An operating system (OS) is system software that manages computer hardware and software resources and provides common services for computer programs. Some key points related to the operating systems and their developers:
- iOS (iPhone OS) is a mobile operating system created and developed by Apple Inc.
- Before Android, Symbian was the operating system which was used by the companies like Nokia, Sony Ericson, Motorola. It was developed by Bugatti.
- Android is a mobile operating system developed by Google
- macOS (previously Mac OS X) is a series of graphical operating systems developed and marketed by Apple Inc.
- Windows operating system is developed by Microsoft.
- Hadoop is an open-source framework that allows to store and process big data in a distributed environment across clusters of computers using simple programming models.
Hence, we conclude that iOS operating system is used in Apple iPhone 6.