Q. Consider the following statements :1. NTPC is the largest power utility in India.2. ONGC accounts for half of the LPG production in India.3. Indian Oil Corporation operates all the oil refineries in India.4. The Indian Ordinance Factory is the largest departmentally run industrial           undertaking in the country.Which of these statements is/are correct ? 

1. 1 only
2. 2 and 3
3. 2,3 and 4
4. 1 and 4