Which of the following is used on iPads?

The correct answer is iOS because it is the operating system specifically developed by Apple for its mobile devices, including the iPad. iOS is designed to provide a user-friendly interface with touch capabilities, extensive app support through the App Store, and seamless integration with other Apple services and devices. This operating system optimizes performance for the hardware configurations found in iPads and enables features that enhance the user experience, such as multitasking capabilities and a robust security framework.

In contrast, the other options refer to different operating systems. Chrome OS is primarily used in Chromebooks and is focused on web-based applications. Windows 10 is a desktop operating system from Microsoft, mainly used on PCs and laptops, not mobile devices like iPads. Android, although a mobile operating system developed by Google, is used in devices from various manufacturers, not by Apple, which produces the iPad. This distinction underscores why iOS is the correct choice for the operating system used on iPads.