Correct Answer: (c) 2 and 4
Solution:As per the question period option (c) could be the correct answer but at present, among the given options, only ESSAR Oil Ltd. (now Nayara Energy Ltd.) is a private sector enterprise while Bongaigaon refinery, Haldia refinery and Manglore refinery are public sector undertakings. Mangalore Refinery and Petrochemicals Limited (MRPL) is a subsid- iary of Oil and Natural Gas Corporation (ONGC) since March, 2003. It was established in 1987 at Katipalla, Mangalore as a joint venture oil refinery promoted by the HPCL, a public sector company and IRIL & Associates (AV Birla Group). Haldia Refinery is one of the two refineries of Indian Oil Group Companies producing Lube Oil Base Stocks (LOBS). It was commissioned in January 1975. Bongaigaon Refinery (BGR) is the 8th refinery of Indian Oil.