Consider the following requirements:
1. Removing all the impurities
2. Tapping the water throughout the year
3. Getting water free suspended and floating solid matter
4. Quantifying the water taken from the source
Which among the above mandate that intake be provided in a water supply scheme?
1
1, 2 and 4
2
1 and 4
3
2 and 3 only
4
2, 3 and 4