a) Bureau of Indian Standards, New Delhi
b) Meteorological Department of the Ministry of Commerce, Govt. of India
c) Indian Institute of Weather Forecasting and Research Centre
d) National Institute of Technology

Answer: b
Explanation: Meteorological Department of the Ministry of Commerce, Govt. of India works throughout the year and records every data possible. They predict the future climatic conditions by comparing the past records of 10 to 15 years. This department has recognised the following four seasons of the year: Cool-dry, Hot-dry season, General Rainy season, Season of the Retreating South-West Monsoon.