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According to the Bureau of Indian Standards (BIS), the domestic water demand in India is measured in LPCD, which stands for liters per capita per day. The correct answer is option 3, which states that the domestic water demand in India is 135 LPCD.
Option 1, which states 60 LPCD, is incorrect. There could be a confusion here, as 60 LPCD is the minimum recommended standard for rural areas by the Government of India, but it is not the overall domestic water demand across the country.
Option 2, which states 100 LPCD, is also incorrect. This is again lower than the actual domestic water demand in India as per the BIS.
Option 4, which states 270 LPCD, is also incorrect. This value is much higher than the actual domestic water demand in India.
Therefore, the correct answer is option 3, 135 LPCD, as per the Bureau of Indian Standards.