Answer: D. Windows operating system
Application software performs specific tasks for an end-user. Google Chrome is an application software and with this app, a user can effectively interact with it. Mobile apps like Facebook, Candy Crush, and Whatsapp are also regarded as application software. Application software differs greatly from system software in the sense that system software is in charge of keeping systems like the Operating System, game engines, and industrial automation. Option D is not an application software because the Windows Operating System is an operating system and therefore used in managing computer software, hardware resources, and also in the provision of common services for computer programs.