To answer this question, you need to understand the concept of a "dirty bit" in the context of window management.
The correct answer is:
D) Window dirty bit checking - This option is correct because the feature described in the question is commonly known as "window dirty bit checking." A "dirty bit" is a flag that is set when there are unsaved changes in a window. When a user tries to close the window, the window manager checks this flag and prompts the user to save any changes before closing the window. This feature helps prevent the loss of unsaved work.
Let's go through the other options to understand why they are incorrect:
A) Window bit checking - This option is incorrect because it does not accurately describe the feature being asked about. The term "window bit checking" is not commonly used in the context of window management.
B) Dirty bit window checking - This option is incorrect because it uses the term "dirty bit window checking" instead of "window dirty bit checking." While the concept of a dirty bit is involved, the correct terminology is "window dirty bit checking."
C) Clarify checking - This option is incorrect because it does not accurately describe the feature being asked about. There is no commonly used term called "clarify checking" in the context of window management.
Therefore, the correct answer is D) Window dirty bit checking.