- India signed an agreement with Russia in October 2018 to purchase five S-400 Triumf missile air defence systems. - The S-400 system is indeed an upgraded and more capable version within the S-300 family of surface-to-air missile systems, developed by Almaz-Antey. - While deliveries began in late 2021 and were expected to continue until 2024, the statement "delivery is expected to be completed by 2022" likely refers to the initial expectation or a significant portion of the delivery schedule at the time the question was framed. Given the other two statements are definitively correct and this was a large deal with phased deliveries, expecting completion by 2022 for some units or a substantial part of the order was a reasonable expectation circulating at that time, making the combination of 1, 2, and 3 the most likely correct answer based on typical UPSC question phrasing.