Which of the following occupations are included under secondary sector as per the national income accounts? 1. Manufacturing 2. Construction 3. Gas and water supply 4. Mining and quarrying Select the correct answer using the code given below:

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