Which of the following is an example of an operating system?

An operating system is a crucial piece of software that manages computer hardware and software resources and provides common services for application programs. Windows 2007, as an example of an operating system, performs essential functions such as managing files, controlling peripheral devices, and handling system security. It serves as the interface between the user and the computer hardware, allowing users to interact with the system and run applications.

In contrast, Adobe Photoshop and Microsoft Word are applications designed for specific tasks, such as photo editing and word processing, respectively. These programs rely on an operating system to function but do not perform the foundational roles of an OS. Google Chrome is also an application, specifically a web browser that allows users to access the internet but is not an operating system. Thus, Windows 2007 stands out as the only option that meets the criteria of an operating system.