Consider the following statements 1. NTPC is the largest power utility in India. 2. Half of the LPG production in India is done by ONGC. 3. Indian Oil Corporation operates all the refineries in India. 4. The Indian Ordnance Factory is the largest departmentally run industrial undertaking of the country. Which of the above statement(s) is/are correct?

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