A bar that inform you the available options in your computer, opened applications, background running applications and can be used to switch between applications quickly is A. Menu bar B. Tool bar C. Status bar D. Task bar

The correct answer is: D. Task bar

A taskbar is a bar at the bottom of the screen that contains icons for open programs and shortcuts to frequently used programs. It can also be used to switch between open programs quickly.

A menu bar is a horizontal bar at the top of a window that contains menus of commands.

A toolbar is a bar that contains buttons or icons that can be used to perform tasks.

A status bar is a bar at the bottom of a window that displays information about the current state of the program.