The correct answer is DOS.Application softwareApplication software is a computing software designed to carry out a specific task other than one relating to the operation of the computer itself, typically to be used by end-users.Classifications of software are system software, relating to the operation of the computer, and utility software.Examples of application software include a word processor, a spreadsheet program, an accounting application, a web browser, an email client, a media player, a console game, or a photo editor. DOSDisk Operating system is an operating system for x86-based personal computers mostly developed by Microsoft.MS-DOS was the main operating system for IBM PC-compatible personal computers during the 1980s.The introduction of Windows 3.0 in 1990, with an easy-to-use graphical user interface, marked the beginning of the end for the command-line driven MS-DOS.Additional InformationWord Processing?It refers to the act of using a computer to create, edit, save and print documents.One example of a Word Processor is Microsoft Word.Computer Graphics?Computer graphics deals with generating images with the aid of computers.Computer graphics is a core technology in digital photography, film, video games, cell phone, and computer displays, and many specialized applications.Spread Sheet?A spreadsheet is a computer application for the organization, analysis, and storage of data in tabular form.Spreadsheets were developed as a computer analogue for paper accounting worksheets.