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Option 1: 1, 2 and 3 - This option states that all three initiatives mentioned in the question are correct. However, this is not the correct answer according to the given information.
Option 2: 1 and 2 only - This option states that only the first and second initiatives are correct. According to the information provided, the implementation of the Nirmal Bharat Abhiyan scheme and the encouragement of the use of bio-toilet facility by DRDO on bio-digester technology are initiatives taken by the Government of India with regard to total sanitation campaign. Therefore, this is the correct answer.
Option 3: 2 and 3 only - This option states that only the second and third initiatives are correct. However, the first initiative of implementing the Nirmal Bharat Abhiyan scheme is also mentioned in the question. So, this option is incorrect.
Option 4: 1 only - This option states that only the first initiative is correct. This is not the correct answer according to the information provided.
Therefore, the correct answer is option 2: 1 and 2 only.