Which of the following defines the Internet of Things?

A$)$ an application of technology, governed by business logic and structured inputs, aimed at automating business processes

B$)$ iterative exploration and investigation of past business performance to gain insight for business planning and decision making

C$)$ computing systems that can perform tasks that normally require human intelligence

D$)$ a system of interrelated computing devices, objects, mechanical and digital machines, people, and animals equipped with unique identifiers that can transfer data and communicate with one another over the Internet