Which of the following is NOT a characteristic of usability?

Usability refers to how effectively, efficiently, and satisfactorily users can interact with a product or system. The characteristics of usability are often defined as effectiveness, efficiency, and satisfaction.

Effectiveness pertains to the accuracy and completeness with which users can achieve their goals using the system. Efficiency measures the resources expended in relation to the accuracy and completeness of goals achieved, essentially how swiftly a user can perform tasks. Satisfaction relates to how pleasant the user finds the interaction with the product, which impacts their overall experience and likelihood of continued use.

Security, while extremely important in the context of user experience, does not fall under the usability umbrella. It focuses on protecting data and maintaining user control over their information, which is a separate aspect of user interaction not directly related to how easily or satisfactorily users can achieve their objectives with a product. Therefore, identifying security as the option that does not belong to the core characteristics of usability is accurate.