A good disinfectant1. Should be persistent enough to prevent regrowth of organisms in the distribution system.2. Must be toxic to micro-organisms at concentrations well above the toxic thresholds of humans and higher animals.3. Should have a fast rate of kill of micro-organisms.Select the correct answer using the codes given below:

A good disinfectant1. Should be persistent enough to prevent regrowth

1.	A good disinfectant1. Should be persistent enough to prevent regrowth of organisms in the distribution system.2. Must be toxic to micro-organisms at concentrations well above the toxic thresholds of humans and higher animals.3. Should have a fast rate of kill of micro-organisms.Select the correct answer using the codes given below:
A.	1, 2 and 3
B.	1 and 2 only
C.	1 and 3 only
D.	2 and 3 only
Answer» D. 2 and 3 only

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