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The correct answer is option 3: 1, 2 and 3.
Statement 1 is correct. India is the second-largest producer of iodized salt globally, after China. This shows the significant production of salt in India.
Statement 2 is correct. Salt mining is carried out in Himachal Pradesh. This suggests that salt production is not limited to coastal regions but also takes place inland in certain areas, like Himachal Pradesh.
Statement 3 is correct. Gujarat is the leading producer of salt in India. This highlights the importance of Gujarat in the salt production industry in India. Gujarat`s favorable climate and extensive coastal area make it an ideal location for salt production.
Statement 4 is not mentioned in the question, so we cannot determine if it is correct or incorrect.
In conclusion, the correct statements are 1, 2, and 3.