Which keys are used to release the keyboard and mouse from a virtual machine?

The combination of the Ctrl and Alt keys is commonly used to release the keyboard and mouse from a virtual machine environment. When working with virtual machines, the host system needs a way to regain control of input devices after the user has interacted with the virtual machine. By pressing Ctrl and Alt together, the input focus is returned to the host operating system, thereby allowing the user to interact with other applications or the desktop outside the virtual environment.

This specific key combination is essential for seamless usability, particularly in scenarios where users may want to switch between the host and guest systems without having to navigate through menus or utilize additional controls. The other options presented do not fulfill this function; thus, they do not hold the same relevance in this context.