The correct answer is option D – All of these
IoT (Internet of Things) technology is a network of physical devices that are connected with electronics like sensors, software, etc. and are used in smartphones, smartwatches, smart fire alarm, fitness trackers, smart security system, etc.
IoT can be integrated with all types of domains such as cloud-based storage and computing, Cyber-Physical Systems, and big data networks, etc.
If you are interested to learn IoT, I suggest this IoT Course by Intellipaat.
You can watch this video on IoT to understand more about IoT Technology: