In user interface terminology, the abbreviation GUI stands for what?

Introduction / Context:
This question focuses on a very common acronym in computing: GUI. GUIs revolutionised the way people interact with computers by replacing purely text based command lines with windows, icons, menus and pointer based interaction. Knowing what GUI stands for is a basic requirement for understanding software design and human computer interaction.

Given Data / Assumptions:

• The question asks for the full form of GUI.
• Options propose several expansions, including Graphical User Interface.
• We assume standard computer science terminology.
• GUI refers to a type of interface, not a unique product name.

Concept / Approach:
GUI is an acronym for Graphical User Interface. It describes an interface in which users interact with graphical elements such as icons, buttons and windows, often via a mouse or touch screen, instead of typing textual commands. Alternatives like Graphical Universal Interface or Graph Use Interface are incorrect wordings that mix familiar terms but do not match the widely accepted expansion used in literature and documentation.

Step-by-Step Solution:
Step 1: Recall that GUI is commonly used to describe interfaces with windows, icons and menus. Step 2: The key idea is that the interface is graphical, meaning it uses visual elements, and that it is designed for users. Step 3: Therefore, the words Graphical, User and Interface must appear in the correct order in the expansion. Step 4: Option d, Graphical User Interface, matches this exactly. Step 5: Graphical Universal Interface changes the core meaning and is not used in standard textbooks. Step 6: Graph Use Interface does not reflect the typical phrase and lacks the clear term user. Step 7: Graphical Unique Interface also rearranges words and does not correspond to the accepted expansion. Step 8: General User Interaction is an invented phrase and not the correct expansion for GUI.

Verification / Alternative check:
Operating system and application documentation frequently refer to Graphical User Interface as GUI. Academic books on human computer interaction or operating systems include chapters titled Introduction to Graphical User Interfaces or GUI Programming. These sources consistently use the phrase Graphical User Interface, leaving no doubt about the correct expansion of the acronym.

Why Other Options Are Wrong:
Graphical Universal Interface, Graph Use Interface and Graphical Unique Interface are not recognised full forms of GUI in any standard reference. They may sound plausible but are not used in industry or education. General User Interaction is a generic phrase and does not match the initial letters G, U and I. Thus, these options must be rejected in favour of the widely accepted expansion.

Common Pitfalls:
Because GUI is so common, some learners memorise it only as three letters and forget the exact words behind them. Others may be tempted by Universal or Unique because they sound impressive. To avoid mistakes, remember that GUI is specifically about an interface used by users, and the central word is User. The phrase Graphical User Interface is simple and descriptive and should be committed to memory as a whole.

Final Answer:
GUI stands for Graphical User Interface.