Information:  - Lieutenant-General Mikhail Timofeyevich Kalashnikov (10 November 1919  23 December 2013) was a Russian general, inventor, military engineer, writer and small arms designer. He is most famous for developing the AK-47 assault rifle and its improvements, the AKM and AK-74, as well as the PK machine gun.  - An assault rifle is a selective-fire rifle that uses an intermediate cartridge and a detachable magazine. Assault rifles were first used during World War II. Though Western nations were slow to accept the assault rifle concept after World War II, by the end of the 20th century they had become the standard weapon in most of the world's armies, replacing semi-automatic rifles, battle rifles and sub-machine guns in most roles. Examples include the StG 44, AK-47 and the M16 rifle.  - Vladimir Oblast ("Vladimirskaya oblast") is a federal subject of Russia (an oblast). Its administrative center is the city of Vladimir, which is located east of Moscow. As of the 2010 Census, the oblast's population was 1,443,693.  - The AK-47, or AK as it is officially known (also known as the Kalashnikov) is a selective-fire (semi-automatic and automatic), gas-operated 7.62×39 mm assault rifle, developed in the Soviet Union by Mikhail Kalashnikov. It is officially known in the Soviet documentation as "Avtomat Kalashnikova".  - The AK-74 (Russian: or "Kalashnikov automatic rifle model 1974") is an assault rifle developed in the early 1970s by Russian designer Mikhail Kalashnikov as the replacement for the earlier AKM (itself a refined version of the AK-47). It uses a smaller 5.45×39mm cartridge, replacing the 7.62×39mm chambering of earlier Kalashnikov-pattern weapons.  - The AEK - 971 is a Soviet / Russian selective fire assault rifle that was developed at the Kovrov Mechanical Plant ( KMZ ) by chief designer Sergey Koksharov in the late 1970s and 1980s . The primary model , the AEK - 971 , uses the 5.45 × 39mm round fed from standard 30 - round or larger box magazines used by the AK - 74 , AK - 74M , and similar weapons .  - The 5.45×39mm cartridge is a rimless bottlenecked rifle cartridge. It was introduced into service in 1974 by the Soviet Union for use with the new AK-74 assault rifle. It gradually supplemented, then largely replaced the 7.62×39mm round in service.  - Nizhny Novgorod, colloquially shortened to Nizhny, is a city in the administrative center of Nizhny Novgorod Oblast and Volga Federal District in Russia. From 1932 to 1990, it was known as Gorky, after the writer Maxim Gorky, who was born there. The city is an important economic, transportation, scientific, educational and cultural center in Russia and the vast Volga-Vyatka economic region, and is the main center of river tourism in Russia. In the historical part of the city there are a large number of universities, theaters, museums and churches. Nizhny Novgorod is located about 400 km east of Moscow, where the Oka empties into the Volga. Population:   - An intermediate cartridge is a rifle/carbine cartridge that is less powerful than typical full-power battle rifle cartridges, such as the .303 British, 7.62×54mmR, 7.92×57mm Mauser or .30-06 Springfield, but still has significantly longer effective range than pistol cartridges. As their recoil is significantly reduced compared to high power rifle cartridges, fully automatic rifles firing intermediate cartridges are relatively easy to control. However, even though less powerful than a traditional rifle cartridge, the ballistics are still sufficient for an effective range of , which are the maximum typical engagement ranges in modern combat. This allowed for the development of the assault rifle, a selective fire weapon that is more compact and lighter than rifles that fire full power cartridges. The first intermediate cartridge to see widespread service was the German 7.92×33mm Kurz used in the StG 44. Other notable examples include the Soviet 7.62×39mm used in the AK-47 and AKM series, and the American 5.56×45mm NATO cartridge first used in the M16.  - A machine gun is a fully automatic mounted or portable firearm, designed to fire bullets in quick succession from an ammunition belt or magazine, typically at a rate of 300 to 1800 rounds per minute. Fully automatic firearms are generally categorized as submachine guns, assault rifles, battle rifles, automatic shotguns, machine guns, or autocannons. Machine guns with multiple rotating barrels are referred to as "rotary machine guns".  - Sergey Ivanovich Koksharov (  ) is a Russian firearm designer working for the "Kovrov Mechanical Plant" (  ). He is most well known for his rifle design, the AEK-971, having variants for 5.45×39mm, 5.56×45mm and 7.62×39mm rounds.  - A battle rifle is a military service rifle that fires a full-power rifle cartridge, such as 7.62×51mm NATO, 7.62×54mmR, 7.92x57mm Mauser, .303 British, or .30-06 Springfield. Compared to assault rifles and their intermediate cartridges, the higher-caliber rounds provide greater power and range, though they have greater weight and produce stronger recoil, making them less than ideal for fully automatic fire.  - The AKM ("Avtomat Kalashnikova Modernizirovanniy" or "Kalashnikov modernized automatic rifle") is a 7.62mm assault rifle designed by Mikhail Kalashnikov. It is a common modernized variant of the AK-47 rifle developed in the 1940s.  - Kovrov is a city in Vladimir Oblast, Russia, located on the right bank of the Klyazma River (a tributary of the Oka). Kovrov's population as of the 2010 Census was 145,214; down from 155,499 recorded in the 2002 Census, and further down from 159,942 recorded in the 1989 Census). In terms of population, it is the second-largest city in Vladimir Oblast (after Vladimir). In 1977, Kovrov's population had been estimated at 140,000.  - Russia (from the  Rus'), also officially known as the Russian Federation, is a country in Eurasia. At , Russia is the largest country in the world by surface area, covering more than one-eighth of the Earth's inhabited land area, and the ninth most populous, with over 140 million people at the end of March 2016. The European western part of the country is much more populated and urbanised than the eastern, about 77% of the population live in European Russia. Russia's capital Moscow is one of the largest cities in the world, other major urban centers include Saint Petersburg, Novosibirsk, Yekaterinburg, Nizhny Novgorod and Samara.    After reading the paragraphs above, choose the best answer for the entity that related to 'aek-971' with the relationship of 'service entry'.  Choices: - 1800  - 1919  - 1974  - 1989  - 1990  - 2010  - 2013  - 2016  - 7
A:
1990