Usability is a part of the user experience as defined in CPUX-R What does usability here consists of?

Usability, as defined by the ISO 9241-11 standard and adopted by the CPUX-F curriculum, is the "extent to which a system, product or service can be used by specified users to achieve specified goals with effectiveness, efficiency and satisfaction in a specified context of use." These three components—effectiveness, efficiency, and satisfaction—are the core measures of usability. They quantify whether users can achieve their goals, the resources they expend in doing so, and their subjective feelings about the interaction.

B. Product, placement and price: These are elements of the marketing mix (4 Ps of marketing), not components of usability.
D. Interaction with social media: This is a potential feature of a system, not a fundamental measure of its usability.
E. Cultural neutrality: This is a desirable quality attribute for international products but is not one of the three core components of the ISO 9241-11 usability definition.

1. International Organization for Standardization. (2018). ISO 9241-11:2018 Ergonomics of human-system interaction — Part 11: Usability: Definitions and concepts. Section 3.1.1.

2. UXQB. (2018). CPUX-F – Curriculum – Foundation Level – Usability and User Experience. Version 3.2.1. Chapter 2.2, "Definition of usability", p. 15.