Function key . . . . . . . . in a windows keyboard can perform many functions, which of the following is not a default-

Option A: F1
This option suggests that the function key F1 on a Windows keyboard can perform many functions, and the statement asks which of the following is not a default. This is correct, as F1 is commonly used for accessing help and support in various applications and operating systems.

Option B: F6
This option suggests that the function key F6 on a Windows keyboard can perform many functions. F6 is often used for navigating between different elements in a window or dialog box, such as tabs, panes, or fields.

Option C: F8
This option suggests that the function key F8 on a Windows keyboard can perform many functions. F8 is typically used during system startup to access advanced boot options like Safe Mode.

Option D: F9
This option suggests that the function key F9 on a Windows keyboard can perform many functions. F9 is commonly used in productivity applications and programming environments for various purposes, such as refreshing content or executing commands.

Conclusion: The correct answer is Option D: F9 because while F1, F6, and F8 have established default functions in Windows and many applications, F9 does not typically have a standardized default function across all Windows systems and software. Its specific function can vary depending on the application or context in which it is used. Therefore, F9 is not considered a default function key with a universally recognized default action in Windows environments.