Information: - Windows 9x is a generic term referring to a series of Microsoft Windows computer operating systems produced from 1995 to 2000, which were based on the Windows 95 kernel and its underlying foundation of MS-DOS, both of which were updated in subsequent versions. This includes all versions of Windows 95 and Windows 98. Windows ME is sometimes included. - The user interface (UI), in the industrial design field of humancomputer interaction, is the space where interactions between humans and machines occur. The goal of this interaction is to allow effective operation and control of the machine from the human end, whilst the machine simultaneously feeds back information that aids the operators' decision-making process. Examples of this broad concept of user interfaces include the interactive aspects of computer operating systems, hand tools, heavy machinery operator controls, and process controls. The design considerations applicable when creating user interfaces are related to or involve such disciplines as ergonomics and psychology. - Killing Floor is a cooperative first - person shooter video game developed and published by Tripwire Interactive . It was originally released as an Unreal Tournament 2004 mod in 2005 . Retail release followed on May 14 , 2009 , for Microsoft Windows , and for OS X on May 5 , 2010 . The Linux version was released on the Steam platform in November 2012 . A sequel was announced on May 8 , 2014 . - A video game is an electronic game that involves human or animal interaction with a user interface to generate visual feedback on a video device such as a TV screen or computer monitor. The word "video" in "video game" traditionally referred to a raster display device, but as of the 2000s, it implies any type of display device that can produce two- or three-dimensional images. Some theorists categorize video games as an art form, but this designation is controversial. - Digital Extremes is a Canadian computer and video game development studio founded in 1993 by James Schmalz, best known for its co-creation of Epic Games' highly successful "Unreal" series of games. Digital Extremes is headquartered in London, Ontario. In 2014, 61% of the company was sold to Chinese holding company Multi Dynamic, now Leyou, for $73 million. President Michael Schmalz and two partners retained 39% of Digital Extremes, and will continue to manage it. - Nvidia Corporation (most commonly referred to as Nvidia, stylized as NVIDIA, nVIDIA or nvidia) is an American technology company based in Santa Clara, California. Nvidia designs graphics processing units (GPUs) for the gaming market, as well as system on a chip units (SOCs) for the mobile computing and automotive market. Nvidia's primary GPU product line, labeled "GeForce", is in direct competition with Advanced Micro Devices' (AMD) "Radeon" products. Nvidia expanded its presence in the gaming industry with its handheld SHIELD Portable, SHIELD Tablet, and SHIELD Android TV. - Microsoft Corporation (commonly referred to as Microsoft or MS) is an American multinational technology company headquartered in Redmond, Washington, that develops, manufactures, licenses, supports and sells computer software, consumer electronics and personal computers and services. Its best known software products are the Microsoft Windows line of operating systems, Microsoft Office office suite, and Internet Explorer and Edge web browsers. Its flagship hardware products are the Xbox video game consoles and the Microsoft Surface tablet lineup. As of 2016, it was the world's largest software maker by revenue, and one of the world's most valuable companies. - A computer monitor or a computer display is an electronic visual display for computers. A monitor usually comprises the display device, circuitry, casing, and power supply. The display device in modern monitors is typically a thin film transistor liquid crystal display (TFT-LCD) or a flat panel LED display, while older monitors used a cathode ray tubes (CRT). It can be connected to the computer via VGA, DVI, HDMI, DisplayPort, Thunderbolt, LVDS (Low-voltage differential signaling) or other proprietary connectors and signals. - Unreal Tournament is a first-person shooter video game developed by Epic Games and Digital Extremes. The second installment in the "Unreal" series, it was first published by GT Interactive in 1999 for Microsoft Windows, and later released on the PlayStation 2 by Infogrames, and on the Dreamcast by Secret Level. Players compete in a series of matches of various types, with the general aim of out-killing opponents. The PC version supports multiplayer online or over a local area network. Free expansion packs were released, some of which were bundled with a 2000 re-release: Unreal Tournament: Game of the Year Edition. - Tripwire Interactive is an American game development studio and publisher based in Roswell, Georgia, formed by members of the international team that created the acclaimed "Unreal Tournament 2004" mod, "". "Red Orchestra" won top prize in the nVidia-sponsored Make Something Unreal competition. Their first retail product, "", was released over Valve Corporation's Steam service on March 14, 2006. They are also a licensee of Epic's Unreal Engine 3. - Microsoft Windows (or simply Windows) is a metafamily of graphical operating systems developed, marketed, and sold by Microsoft. It consists of several families of operating systems, each of which cater to a certain sector of the computing industry with the OS typically associated with IBM PC compatible architecture. Active Windows families include Windows NT, Windows Embedded and Windows Phone; these may encompass subfamilies, e.g. Windows Embedded Compact (Windows CE) or Windows Server. Defunct Windows families include Windows 9x; Windows 10 Mobile is an active product, unrelated to the defunct family Windows Mobile. - IBM PC compatible computers are those similar to the original IBM PC, XT, and AT, able to run the same software and support the same expansion cards as those. Such computers used to be referred to as PC clones, or IBM clones. They duplicate almost exactly all the significant features of the PC architecture, facilitated by IBM's choice of commodity hardware components and various manufacturers' ability to reverse engineer the BIOS firmware using a "clean room design" technique. Columbia Data Products built the first clone of the IBM personal computer by a clean room implementation of its BIOS. - Epic Games, Inc. (formerly Potomac Computer Systems and later Epic MegaGames, Inc.) is an American video game development company based in Cary, North Carolina, partially owned by Tencent. Founded in 1991, they are best known for their Unreal Engine technology, which has powered their popular in-house "Unreal", "Gears of War" and "Infinity Blade" series of games. - An operating system (OS) is system software that manages computer hardware and software resources and provides common services for computer programs. All computer programs, excluding firmware, require an operating system to function. - Unreal Tournament 2004 is a first-person shooter video game developed by Epic Games and Digital Extremes. It is part of the "Unreal" series, specifically the subseries started by the original "Unreal Tournament". It is the sequel to "Unreal Tournament 2003". After reading the paragraphs above, we are interested in knowing the entity with which 'killing floor ' exhibits the relationship of 'software engine'. Find the answer from the choices below. Choices: - computer - dreamcast - nvidia - playstation 2 - unreal engine
A:
unreal engine