Which of the following operating systems is an example of a Network Operating System (NOS)?

Windows Server is considered a Network Operating System (NOS) because it is specifically designed to manage network resources and provide services to client machines on a network. A NOS facilitates communication between computers, allows for user account management, enables file sharing, and supports various network protocols to ensure that connected devices can efficiently share resources.

Operating systems like Windows Server are optimized for managing large networks in organizational settings, providing features such as centralized administration, security configuration, and support for server hardware. This allows businesses to deploy applications, manage user access, and secure data over the network effectively.

In contrast, the other options—Microsoft Word, Adobe Photoshop, and Mozilla Firefox—are software applications rather than operating systems. Microsoft Word is a word processing application, Adobe Photoshop is used for image editing, and Mozilla Firefox is a web browser. None of these serve as an operating system that directly manages networked computers or resources, which is what defines a Network Operating System.