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If the coli form bacteria is present in a sample of water, then the coli-form test to be conducted is (i) Presumptive coli-form test (ii) Confirmed coli-form test (iii) Completed coli-form test
Options:
A .  Only (i)
B .  Both (i) and (ii)
C .  Both (i) and (iii)
D .  All (i), (ii) and (iii)
Answer: Option D
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