I think assembly level command mov ,push ,call
D I think because none of the others seem like very important things,
The Answer is toolbar.
<span>The mini or small toolbar contains frequently used formatting commands that are displayed when selecting text or objects with the mouse.
Toolbar is also known as Ribbon. It is present in computer interface design. We can see toolbar in many softwares like Microsoft office suite, web explorer, designing softwares etc. it is mostly present under the menu bar and it has many options.</span>
