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# In tertiary water treatment,for the removal of pathogens which substance can be used?

$\begin{array}{1 1}(a)\;\text{UV}\\(b)\;\text{Ozone}\\(c)\;\text{Perchlorate}\\(d)\;\text{All of these}\end{array}$

UV,ozone,perchlorate.
Hence (d) is the correct answer.