The answer is A! Hope this is helpful!
the answer is D which is system utilities
hope this helps and hope it isn't wrong
Answer:
User application
Explanation:
A user application is a program that is created by using a standard software that is adjusted to the user's needs that can't be fulfilled by an existing system. According to this, the answer is that a user application utilizes standard business software, such as Microsoft Word or Microsoft Excel, which has been configured in a specific manner to enhance user productivity.
Unix. GUIs were first shown at Xerox PARC (Palo Alto Research Center) in 1973. X-Windows is used on Unix to decouple I/O from processing, in other words what you're working on can be displaying on your computer but executing on another. NeXTstep is Apple's Unix developed on/from/with BSD (Berkley Software Division) Unix. I would assume that suntools were developed on Sun Solaris.