Correct option is D
Devratnas is not one of the statuses granted to public sector units (PSUs) to grant them autonomy.
Incorrect options explanation:
Maharatnas', Navratnas' and 'Miniratnas' are classifications of Public Sector Units in India. The government has granted enhanced powers to the Boards of Directors of the profitmaking Central Public Sector Enterprises (CPSEs) under various schemes like Maharatna, Navratna and Miniratna.
Maharatna - It was introduced in 2010. At present, there are 11 Maharatna Companies in India. Some examples are - Bharat Heavy Electricals Limited, Coal India Limited and GAIL India Limited.
Navratna The government introduced the Navratna scheme in 1997. At present, there are 14 Navratna Companies in India. Some examples are: Bharat Electronics Limited and Hindustan Aeronautics Limited.
Miniratnas This scheme was introduced by the government in October 1997. At present, there are 73 Navratna Companies in India. Some examples are –
- Category I - Airports Authority of India (AAI)
- Category II - National Film Development Corporation Limited.