Option 1 -> Department of Revenue deals with tax policy and administration under the Ministry of Finance, not GDP reporting.
Option 2 -> Central Board of Direct Taxes is responsible for administering direct tax laws in India, not GDP calculation.
Option 3 -> Central Statistics Office (now part of National Statistical Office under MoSPI) is the official body that compiles and releases GDP data in India.
Option 4 -> Niti Ayog is a policy think tank providing strategic inputs to the government, not involved in GDP reporting.
Hence, Option 3: Central Statistics Office -> The Central Statistics Office, which is now part of the National Statistical Office (NSO) under the Ministry of Statistics and Programme Implementation (MoSPI), is the official authority responsible for compiling, calculating, and releasing GDP and other national accounts statistics in India. It releases quarterly and annual GDP estimates along with other important economic indicators-> correct