Minimum requirement of potable water is all, except -

• A. 95% of sample should not contain any coliform organisms in 100 ml
• B. No sample shpuld contain E coli in 100 ml
• C. No sample shpuld contain more than 3 coliform organisms per 100 ml
• D. Coliform organism may (1 to 2) or may not be detectable in 100ml of any two consecutive sample