Which of the following are some important pollutants released by the steel industry in India?1. Oxides of sulphur2. Oxides of nitrogen3. Carbon monoxide4. Carbon dioxideSelect the correct answer using the code given below.

• A. 1, 3 and 4 only
• B. 2 and 3 only
• C. 1 and 4 only
• D. 1, 2, 3 and 4