What feature was created for users who prefer to use the keyboard rather than the mouse, and provides keyboard code icons that may be used in conjunction with the alt key?

The answer is Key Tips.   The feature created for users who prefer to use the keyboard rather than the mouse, and provides keyboard code icons that may be used in conjunction with the alt key is the Key Tips. A keytip is a keyboard shortcut to use a function on a ribbon, also called a ribbon control. 

4because of my mind tells me to pick 4