What does network software primarily manage?

Network software primarily manages communications protocols on the network because its main function is to facilitate the exchange of data between devices over a network. This type of software ensures that different hardware and systems are able to communicate effectively by translating the data into formats that can be understood by all connected devices.

Communications protocols are sets of rules that determine how data is transmitted and received, ensuring proper communication and control over the data exchange process. By managing these protocols, network software plays a critical role in ensuring the reliability, efficiency, and security of network operations.

The other options focus on entirely different functions; power supply commands relate to hardware management, graphics and video output pertain to visual displays, and user interface design is concerned with how users interact with software applications. These aspects do not fall under the core responsibilities of network software, which is dedicated to managing communication processes within a networked environment.