The correct answer is option 4, Oil India Ltd. The question asks for the "Navaratna" Public Sector Enterprise that is not included in the options provided.

A "Navaratna" Public Sector Enterprise refers to nine highly respected and valuable state-owned companies in India. These companies are recognized for their excellence and are considered to be jewels of the nation. They have been given greater autonomy and flexibility in their decision-making and financial management.

Option 1, Hindustan Petroleum Corporation Ltd., and option 2, Indian Oil Corporation Ltd., are both Navaratna Public Sector Enterprises. These companies are involved in the oil and gas industry and have a significant presence in India.

Option 3, Oil and Natural Gas Corporation Ltd., is also a Navaratna Public Sector Enterprise. This company is one of the largest oil and gas exploration and production companies in India.

Therefore, option 4, Oil India Ltd., is the correct answer as it is not a Navaratna Public Sector Enterprise. Oil India Ltd. is another oil exploration and production company in India, but it does not hold the status of being a Navaratna company.

In summary, the correct answer is option 4, Oil India Ltd.