Which of the following is a primary function of a display server in Linux?

The primary function of a display server in Linux is to transmit graphical information to the hardware. This involves managing the graphical output to the screen and handling input devices like the keyboard and mouse. The display server acts as a mediator between the graphical environment and the underlying hardware, ensuring that the graphical applications can present their content effectively on the screen.

The display server also plays a crucial role in rendering windows, managing their position and visibility, and facilitating interactions between the user and the graphical applications. By transmitting graphical information, the display server enables applications to display their user interfaces and respond to user actions.

In contrast, managing file permissions relates to the operating system's security mechanisms, handling system updates pertains to package management and system maintenance, and running background processes involves managing system tasks that operate without user interaction. These functions are not directly related to the display server's role in the Linux environment.