What characterizes a network?

A network is characterized by a group of computers and other devices that are interconnected to facilitate the exchange of data and resources. This definition includes various types of connections—whether wired or wireless—and encompasses a diverse range of devices, such as personal computers, servers, printers, and mobile devices, all working together to share information. The primary purpose of a network is communication and collaboration, allowing multiple devices to access shared resources and information efficiently. This is what makes option A the correct choice, as it accurately describes the fundamental nature of a network.

The other options do not align with the definition of a network. A single standalone computer represents an isolated system and does not involve interconnectivity or data exchange with other devices. Only mobile devices linked wirelessly suggests a limitation to one type of device and excludes other critical components of a network. Similarly, a database of resources refers to a structured repository of information rather than a system design focused on connecting devices for data exchange.