Which of the following represents an example of a smart device?

A smart device is characterized by its ability to connect to the Internet, collect and share data, and often be controlled remotely, typically through a mobile app or web interface. A smart thermostat exemplifies this concept perfectly. It allows users to adjust temperature settings from anywhere via an app, learn user behaviors over time to optimize heating and cooling, and can even integrate with other smart home systems to enhance energy efficiency.

In contrast, a desktop computer, while powerful and capable of connecting to the Internet, serves more traditional computing functions and does not embody the specific attributes of a smart device designed for automation and remote control. Similarly, external hard drives and USB flash drives are primarily storage devices and lack the interconnectedness or smart functionality that defines smart technology. They are not designed to interact with other devices over the Internet or provide smart automation features.