$A$ - The salt concentration is less than $5$ (parts per thousand) in inland waters.
$R$ - The salt concentration is $30 - 35$ (parts per thousand) in the sea.
$R$ - The salt concentration is $30 - 35$ (parts per thousand) in the sea.
- A$A$ and $R$ both are correct.
- B$A$ and $R$ both are incorrect.
- C$A$ is correct,$R$ is incorrect.
- D$A$ is incorrect,$R$ is correct.
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