With reference to the Biological Oxygen Demand (BOD) and river pollution monitoring in India, consider the following statements.
- The Central Pollution Control Board (CPCB) monitors river water quality in India based on BOD levels.
- A river stretch with BOD greater than 3 mg/l is considered unfit for bathing.
- River stretches with BOD exceeding 30 mg/l are classified as ‘Priority 1’ - most polluted.
How many of the above statements are correct?