Information: - Linux (pronounced or, less frequently) is a Unix-like computer operating system assembled under the model of free and open-source software development and distribution. The defining component of Linux is the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. The Free Software Foundation uses the name GNU/Linux to describe the operating system, which has led to some controversy. - Half-Life 2 (stylized as HLF-LIFE) is a first-person shooter video game developed and published by Valve Corporation. The sequel to 1998's "Half-Life", it was released in November 2004, following a five-year, $40 million development phase, during which a substantial part of the project was leaked and distributed on the Internet. The game was developed alongside Valve's Steam software and the Source engine. - Valve Corporation (commonly referred to as Valve) is an American video game developer and digital distribution company headquartered in Bellevue, Washington. The company is known for the "Half-Life", "Counter-Strike", "Portal", "Day of Defeat", "Team Fortress", and "Left 4 Dead" series, "Dota 2", and its software distribution platform Steam. - Dear Esther is a first-person video game developed by The Chinese Room for Microsoft Windows, Mac OS X, and Linux. First released in 2008 as a free-to-play modification for the Source game engine, the game was entirely redeveloped for a commercial release in 2012. Spurning traditional game design, "Dear Esther" features virtually no puzzles or tasks. The player's only objective is to explore an unnamed island in the Hebrides, listening to a troubled man read a series of letters to his deceased wife. Details of her mysterious death are revealed as the player moves throughout the island. - 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. - Korsakovia is a single - player mod for Valve Corporation 's video game Half - Life 2 . It was developed by The Chinese Room , known for Dear Esther , and Amnesia : A Machine for Pigs . Korsakovia was released for free download on September 20 , 2009 . - Left 4 Dead is a cooperative first-person shooter video game with survival horror elements, developed by Valve South and published by Valve Corporation. The game uses Valve's proprietary Source engine, and is available for Microsoft Windows, Xbox 360 and OS X. Development on the game was completed on November 13, 2008, and two versions were released digitally: A downloadable digital version, released on November 17, 2008, and a digital retail disc version, with a release date determined by region. The digital retail disc version was released in North America and Australia on November 18, 2008; and in Europe on November 21, 2008. After reading the paragraphs above, we are interested in knowing the entity with which 'korsakovia' exhibits the relationship of 'software engine'. Find the answer from the choices below. Choices: - computer - source
source

(Q).
Information: - The Royal Air Force (RAF) is the United Kingdom's aerial warfare force. Formed towards the end of the First World War on 1 April 1918, it is the oldest independent air force in the world. Following victory over the Central Powers in 1918 the RAF emerged as, at the time, the largest air force in the world. Since its formation, the RAF has taken a significant role in British military history, in particular, playing a large part in the Second World War where it fought its most famous campaign, the Battle of Britain. - Air commodore (abbreviated as Air Cdre in the RAF, IAF and PAF; AIRCDRE in the RNZAF and RAAF) is a one-star rank and the most junior general rank of the air-officer which originated in and continues to be used by the Royal Air Force. The rank is also used by the air forces of many countries which have historical British influence such as Bangladesh, and it is sometimes used as the English translation of an equivalent rank in countries which have a non-English air force-specific rank structure. The name of the rank is always the full phrase and is never shortened to Commodore, which is a rank in various naval forces. Air commodore is a one-star rank and the most junior air officer rank, being immediately senior to group captain and immediately subordinate to air vice-marshal. It has a NATO ranking code of OF-6 and is equivalent to a commodore in the Royal Navy or a brigadier in the British Army or the Royal Marines. Unlike these two ranks, however, it has always been a substantive rank. Additionally, air commodores have always been considered to be air officers whilst Royal Navy commodores have not since the Napoleonic Wars been classified as officers of flag rank, and British Army brigadiers have not been considered to be general officers since 1922 when they ceased to be titled as brigadier-generals. In other NATO forces, such as the United States Armed Forces and the Canadian Armed Forces, the equivalent one-star rank is brigadier general. - Group Captain Kenneth Gilbert Hubbard OBE , DFC , AFC ( 26 February 1920 -- 21 January 2004 ) was the pilot of an RAF Valiant bomber which dropped Britain 's first live megaton thermo - nuclear weapon ( the H - Bomb ) in the southern Pacific Ocean in 1957 . - The British Army is the principal land warfare force of the United Kingdom. The force was initially administered by the War Office from London, which in 1964 was subsumed into the Ministry of Defence. The professional head of the British Army is the Chief of the General Staff. - The Corps of Royal Marines (RM) is the United Kingdom's amphibious light infantry force, forming part of the Naval Service, along with the Royal Navy. The Royal Marines were formed in 1755 as the Royal Navy's infantry troops. However, the marines can trace their origins back to the formation of the English Army's "Duke of York and Albany's maritime regiment of Foot" at the grounds of the Honourable Artillery Company on 28 October 1664. - Group captain (Gp Capt in the RAF, IAF and PAF, GPCAPT in the RNZAF and RAAF; formerly sometimes G/C in all services) is a senior commissioned rank which originated in and continues to be used by the Royal Air Force. The rank is also used by the air forces of many countries which have historical British influence and it is sometimes used as the English translation of an equivalent rank in countries which have a non-English air force-specific rank structure. It ranks above wing commander and immediately below air commodore. The name of the rank is the complete phrase, and is never shortened to "captain". It has a NATO ranking code of OF-5, and is equivalent to a captain in the Royal Navy or a colonel in the British Army or the Royal Marines. Group captain is the rank usually held by the station commander of a large RAF station. - The Royal Navy (RN) is the United Kingdom's naval warfare force. Although warships were used by the English kings from the early medieval period, the first major maritime engagements were fought in the Hundred Years War against the kingdom of France. The modern Royal Navy traces its origins to the early 16th century; the oldest of the UK's armed services, it is known as the Senior Service. After reading the paragraphs above, we are interested in knowing the entity with which 'kenneth hubbard' exhibits the relationship of 'military branch'. Find the answer from the choices below. Choices: - air force - army - british army - infantry - navy - royal air force - royal marines - royal navy
(A).
royal air force