Which principle states that the design should provide a variety of options for its use?

The principle of "Flexibility in use" emphasizes that designs should accommodate a wide range of individual preferences and abilities. This principle advocates for providing multiple ways of interacting with and utilizing a design, allowing users to engage with the interface or product in a way that best suits their needs. By incorporating various options, the design can cater to diverse user demographics, including those with disabilities or varying levels of experience, thus enhancing overall usability and accessibility.

This principle is critical as it promotes inclusivity, ensuring that different user needs are met through various methods of interaction, whether via touchpoints, navigation methods, or customized settings. It recognizes that not all users approach tasks in the same way, and being flexible in design allows for a more personalized experience.