Which of the following not belongs to the system software category?Adobe PhotoshopUbuntuWindowsAvast

To determine which option does not belong to the system software category, we first need to understand the definitions and classifications of system software and application software.

1. System Software: This includes the operating system and all system utilities that manage computer resources at a low level. Examples include operating systems like Windows and Ubuntu.

2. Application Software: This software is designed to perform specific tasks for users. Adobe Photoshop is a graphic design application, and Avast is an antivirus application.

Now, let's analyze each option:

1. Adobe Photoshop: This is application software used for image editing and graphic design.
2. Ubuntu: This is an operating system based on Linux, thus classified as system software.
3. Windows: This is another operating system, specifically Microsoft Windows, and is also categorized as system software.
4. Avast: Avast is an antivirus software, so it falls under application software since it performs a specific task for the user's benefit.

Conclusion

Based on this analysis, the option that does not belong to the system software category is Adobe Photoshop.