Which of the following is a common example of hardware?

The choice of a printer as a common example of hardware is correct because hardware refers to the physical components of a computer system that you can touch and see. A printer is a tangible device used for producing physical copies of documents, photos, or graphics from a computer or another digital source. It connects to the computer system and operates through physical mechanisms, such as ink or laser technology, to output information.

In contrast, the other options provided—operating systems, web browsers, and word processors—are software applications. They are programs and operating environments that run on hardware to perform specific tasks, but they do not have a physical form as hardware does. An operating system manages the computer's hardware and software resources, while web browsers and word processors serve as software applications for accessing the internet and creating documents, respectively.