An example of a mobile device operating system is?

Apple iOS is a mobile device operating system designed specifically for iPhones and iPads. It provides a user-friendly interface optimized for touch input and supports a vast array of mobile applications through the App Store. iOS is known for its performance, security features, and continuous updates, making it a prime choice for mobile devices.

On the other hand, Ubuntu, Windows 10, and Red Hat Enterprise Linux are all operating systems primarily designed for desktops and servers. While they can provide robust functionalities for computer systems, they do not cater specifically to the needs of mobile devices, which require different architectures and interfaces to support portable and touch-based interactions effectively. This distinction highlights why Apple iOS is the correct example of a mobile device operating system.