Which of the following is a primary function of a file manager?

The primary function of a file manager is to facilitate file organization. This involves managing how files and directories are structured, stored, and retrieved on a computer system. A file manager allows users to create, delete, move, and rename files and folders, providing a systematic way to categorize and organize data. It also helps users manage permissions and access settings for different files, ensuring an efficient workflow.

The other aspects mentioned, such as data storage and network connectivity, while related to the broader functionality of computer systems, do not specifically encapsulate the core responsibilities of a file manager. User authentication is primarily concerned with verifying user identities for security, rather than the organization and management of files. Thus, file organization distinctly highlights the essential role of a file manager in overseeing the structure of a system's data.