With reference to Biochemical Oxygen Demand (BOD) and Chemical Oxygen Demand (COD), consider the following statements: 1. BOD measures only the biodegradable organic matter in a water sample, whereas COD measures both biodegradable and non-biodegradable organic matter. 2. The chemical oxidant used in the standard COD test is potassium dichromate in an acidic medium. 3. For any given polluted water sample, the BOD value is always higher than the COD value. Which of the statements given above is/are correct?

Options:

• A: 1 and 2 only
• B: 2 and 3 only
• C: 1 and 3 only
• D: 1, 2 and 3

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