The table describes three types of water.
Which statement is correct?

Only Q and R are suitable for drinking, while P could be used for irrigation.
2 )
Only Q and R are suitable for drinking, while P is unsuitable for any purpose.
3 )
Only Q is suitable for drinking. R could be used for washing cars and P for irrigation.
4 )
P, Q and R are suitable for irrigation and washing cars, but are not suitable for drinking.
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