Answer the following question: Information:  - Ristar, released as in Japan, is a platform game developed by Sonic Team and published by Sega for the Sega Genesis, which released worldwide in February 1995. A Sega Game Gear game, of the same name and genre, "Ristar", was also released, which shared similar themes, while possessing different level design and gameplay mechanics.  - Softdisk is a software and Internet company based in Shreveport, Louisiana. Founded in 1981, its original products were disk magazines (which they termed "magazettes", for "magazine on diskette"). They were affiliated and partly owned by paper magazine "Softalk" at their founding, but survived its demise.  - John D. Carmack (born August 20, 1970) is an American game programmer, aerospace and virtual reality engineer. He co-founded id Software. Carmack was the lead programmer of the id video games "Commander Keen", "Wolfenstein 3D", "Doom", "Quake", "Rage" and their sequels. Carmack is best known for his innovations in 3D graphics, such as his famous Carmack's Reverse algorithm for shadow volumes, and is also a rocketry enthusiast and the founder and lead engineer of Armadillo Aerospace. In August 2013, Carmack took the position of CTO at Oculus VR, which in 2014 became a subsidiary of Facebook.  - The Internet is the global system of interconnected computer networks that use the Internet protocol suite (TCP/IP) to link devices worldwide. It is a "network of networks" that consists of private, public, academic, business, and government networks of local to global scope, linked by a broad array of electronic, wireless, and optical networking technologies. The Internet carries an extensive range of information resources and services, such as the inter-linked hypertext documents and applications of the World Wide Web (WWW), electronic mail, telephony, and peer-to-peer networks for file sharing.  - id Software LLC (formerly id Software, Inc., ; see Company name) is an American video game developer headquartered in Dallas, Texas. The company was founded on February 1, 1991, by four members of the computer company Softdisk, programmers John Carmack and John Romero, game designer Tom Hall, and artist Adrian Carmack (no relation to John Carmack). Business manager Jay Wilbur was also involved.  - A disk magazine, colloquially known as a diskmag or diskzine, is a magazine that is distributed in electronic form to be read using computers. These had some popularity in the 1980s and 1990s as periodicals distributed on floppy disk, hence their name. The rise of the Internet in the late 1990s caused them to be superseded almost entirely by online publications, which are sometimes still called "diskmags" despite the lack of physical disks.  - A Platform game (or platformer) is a video game which involves guiding an avatar to jump between suspended platforms and/or over obstacles to advance the game. The player controls the jumps to avoid letting the avatar fall from platforms or miss necessary jumps. The most common unifying element of games of this genre is the jump button, but now there are other alternative like swiping in touchscreen. "Jumping", in this genre, may include swinging from extendable arms, as in "Ristar" or "Bionic Commando", or bouncing from springboards or trampolines, as in "Alpha Waves". These mechanics, even in the context of other genres, are commonly called "platforming", a verbification of "platform". Games where jumping is automated completely, such as 3D games in "The Legend of Zelda" series, fall outside of the genre.  - Shadow Knights is a platform game created by id Software and published by Softdisk in 1991 . This is one of the several games written by id Software to fulfill their contractual obligation to produce games for Softdisk , where the id Software founders formerly were employed . It is a basic platform game with a considerable influence by the early Ninja Gaiden games .    Given the information above, choose from the list below the object entity that exhibits the relation 'distribution' with the subject 'shadow knights'.  Choices: - facebook  - floppy disk  - internet  - japan  - touchscreen
Answer:
floppy disk