Water is purified using several processes.
Four of the processes are listed.
1 Chlorine is added to water to kill any bacteria.
2 Water is passed through coarse gravel to remove large pieces of dirt.
3 Water is passed through wire screens to remove large twigs.
4 Water is passed through fine sand to remove small particles.
In which order are the processes carried out?
1 )
$1 \to 2 \to 3 \to 4$
2 )
$2 \to 1 \to 4 \to 3$
$3 \to 2 \to 4 \to 1$
4 )
$4 \to 3 \to 2 \to 1$
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