Explanation:

All statements are correct.

• According to the Constitution, Articles 15(4), 15(5) and 16(4) confer power on a state to identify and declare the list of SEBCs (Socially and Educationally Backward Classes). 
• In the famous Indra Sawhney case (1992), the scope and extent of Article 16(4), which provides for the reservation of jobs in favour of backward classes, has been examined thoroughly by the Supreme Court.
• The Supreme Court held that the advanced sections among the OBCs (the creamy layer) should be excluded from the list of beneficiaries of reservation.
• The Rohini Commission was constituted in October 2017 under Article 340 of the Constitution. It had been constituted to complete the task of sub-categorising 5000-odd castes in the central OBC. 

Hence option 4th is correct.