Which_of_the_following_process_is_used_for_the_preparation_of_sulphuric_acid?

• A. Ostwald‚Äö√Ñ√∂‚àö√ë‚àö¬•s process
• B. Bergius process
• C. Deacon‚Äö√Ñ√∂‚àö√ë‚àö¬•s process
• D. Chamber process