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Given below are two statements : Statement-I : If BOD is 4 ppm and dissolved oxygen is 8 ppm, then it is a good quality water. Statement-II : If the concentration of zinc and nitrate salts are 5 ppm each, then it can be a good quality water. In the light of the above statements, choose the most appropriate answer from the options given below :

1. Statement I is correct but Statement II is incorrect
2. Statement I is incorrect but Statement II is correct
3. Both the statements I and II are incorrect
4. Both the statements I and II are correct

Correct answer: Both the statements I and II are correct

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