If the coliform bacteria is present in a sample of water, then the coliform test to be conducted is

i) presumptive coliform test

ii) comfirmed coliform test

iii) completed coliform test

The correct answer is

- 1
  
  only (i)
- 2
  
  both (i) and (ii)
- 3
  
  both (i) and (iii)
- 4
  
  all (i), (ii) and (iii)

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