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Water samples with BOD values of 4 ppm and 18 ppm, respectively, are:
(1) Clean and Clean
(2) Highly polluted and Clean
(3) Clean and Highly polluted
(4) Highly polluted and Highly polluted
Clean water would have BOD value < 5 ppm whereas highly polluted water could have BOD value $\geq$ 17 ppm.
BETA
