With reference to the sectors of the Indian economy, consider the following pairs : Economic activity | Sector 1. Storage of agricultural produce | Secondary 2. Dairy farm | Primary 3. Mineral exploration | Tertiary 4. Weaving cloth | Secondary How many of the pairs given above are correctly matched ?

1. (a)Only one
2. (b)Only two
3. (c)Only three
4. (d)All four