インドにおける「Navratna companie」とは？英語で回答してください。
Navratna companies means 'Public sector undertakings in India.
Public Sector Undertakings(PSUs)are State-owned enterprises, which are established and owned by the Government of India or State governments of India. The public sector undertakings are established either by nationalisation or an executive order incase of union government and state government or act of parliament with the purpose to earn profit for the government, control monopoly of the private sector entities, offer products&services at an affordable price to the citizens, implementation of government schemes and to deliver products&services to remote locations of the country.
A score of 60(out of 100), based on six parameters which include net profit, net worth, total manpower cost, the total cost of production, cost of services,  PBDIT(Profit Before Depreciation, Interest, and Taxes), capital employed, etc., AND A PSU must first be a Miniratna and have 4 independent directors on its board before it can be made a Navratna.