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Consider the following statements regarding removal of impurities from water: 
1) Settleable solids are removed by filtration. 
2) Volatile solids are removed through sedimentation. 
3) Dissolved solids are removed through reverse osmosis. 
4) Colloidal solids are removed by coagulation. 
Which of the above statements are correct?

[ESE (IES) CE 2017 Technical]
A
B
C
D
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