Which organization developed the Open Systems Interconnection (OSI) model?

The Open Systems Interconnection (OSI) model was developed by the International Organization for Standardization (ISO), making that the correct answer. The OSI model is a conceptual framework that standardizes the functions of a telecommunication or computing system into seven abstraction layers, aimed at guiding product development and facilitating communication between different systems.

The ISO's involvement emphasizes its role in developing international standards that promote interoperability and open communication across diverse systems and technology. By creating the OSI model, the ISO sought to improve the interface between different networking systems, ultimately leading to more effective and universal network communications.

The other organizations mentioned, while influential in their respective fields, did not create the OSI model. The International Telecommunication Union (ITU) focuses on information and communication technologies and standardization, while the Institute of Electrical and Electronics Engineers (IEEE) is renowned for its contributions to electrical engineering and computer science standards. The World Wide Web Consortium (W3C) primarily develops web standards such as HTML and CSS, not the OSI model. Thus, the ISO's development of the OSI model is significant in establishing a structured approach to networking protocols.