In what year were graphical user interfaces (guis) pioneered? 1969 1974 1991 2001

The correct option for the following question will be 1969.

Explanation:

GUI stands for Graphical User Interface, developed by Douglas Engelbart Alan Kay at Xerox PARC and was pioneered in 1969. The type of actions that can be taken by the user represented by the graphical user interface and it interacts with the user when the objects changes color, size or visibility.

The objects like button, cursor and icons included in the GUI, these elements can be enhanced with visual effects or sound. The GUI considered as more user-friendly than MS-DOS (text based) and the UNIX shell (operating system).

the anwser is ethier d or e