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Arrange the following in correct sequence regarding rainwater harvesting.
I. Pipes are connected to underground tanks.
II. Rocks and sand in the tanks filter the rainwater.
III. Rainwater from rooftops is collected using pipes.
IV. Clean water is then available for drinking purposes.
Option
(a) III, I, II and IV
(b) IV, I, III and II
(c) II, I, III and IV
(d) I, III, II and IV

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