Which of the following is NOT one of the three main aspects of interoperability in IoT?

Interoperability in the Internet of Things (IoT) is crucial for ensuring that different devices and systems can work together effectively. The three main aspects of interoperability typically include discovery, access control, and usage.

Discovery refers to the ability of devices to find and recognize one another within a network, facilitating seamless connection and communication. Access control is essential for security, determining who or what can access which data and resources within the IoT ecosystem. Usage encompasses how devices communicate and interact based on protocols and standards.

While compatibility is important in IoT, it typically refers to the degree to which different systems and devices can work together, rather than being a direct aspect of interoperability itself. Hence, compatibility is not prioritized in the main framework of interoperability aspects, making it the correct response to the question.