Which of the following are examples of IoT (Internet of Things)?

The choice highlighting refrigerators that track food inventory is a clear example of the Internet of Things (IoT) because it illustrates the core principle of IoT: devices connected to the internet that collect and exchange data. In this case, the refrigerator uses sensors to monitor the contents inside and send that data to a smartphone app or cloud service, enabling users to track what food items they have and receive notifications when supplies are low.

This connectivity allows the device to execute functions beyond traditional capabilities, providing users with real-time updates and increasing convenience in managing household inventory. The nature of IoT is fundamentally about enhancing the functionality of everyday objects through connectivity and data sharing, which this example exemplifies well.

While online car dealerships, teachers posting assignments online, and smart thermostats exhibit aspects of technology and connectivity, they do not fundamentally capture the essence of IoT devices as those in the food tracking scenario do. These other options don’t necessarily involve the kind of device-to-device or device-to-internet data exchange specific to IoT.