The two major categories of software are: application software and system software.

  • Application software is used to perform specific tasks or applications, such as word processing, spreadsheets, games, and web browsers.
  • System software is used to control the computer's hardware and to provide a platform for running application software. Examples of system software include operating systems, device drivers, and file management utilities.

B. UNIX software is a type of system software. It is a multitasking, multiuser operating system that is widely used on servers and workstations. C. High-level languages are a type of programming language that is designed to be easier to use than machine code. They are used to write application software. D. CAD software is a type of application software that is used for computer-aided design. It is used to create 2D and 3D models of objects. E. None of the above is a major category of software.