_____ operating system was one of the first to utilize a GUI.Question 4Answera.Macb.Windowsc.Unixd.Android

To answer the question about which operating system was one of the first to utilize a Graphical User Interface (GUI), let's analyze the options provided:

1. Mac: The Macintosh Operating System, developed by Apple, was one of the first operating systems to incorporate a GUI, launching in 1984.

2. Windows: Microsoft Windows introduced its first GUI (Windows 1.0) in 1985, following in the footsteps of the Mac OS.

3. Unix: While Unix systems have GUIs, the original Unix operating system did not originally come with a GUI and is primarily command-line based.

4. Android: Android, developed by Google, is a mobile operating system with a GUI, but it was released much later in 2008.

Conclusion:

Considering the historical context, the correct answer to the question is a. Mac. The Macintosh operating system was one of the first to really bring a GUI to personal computers and set the standard for future OS designs.