Explanation:

Recently, the Supreme Court has upheld the govt scheme for one rank, one pension (OROP).

• OROP means the payment of the same pension to military officers for the same rank for the same length of service, irrespective of the date of retirement.
• Before OROP, ex-servicemen used to get pensions as per the Pay Commission's recommendations of the time when they had retired.
• Armed Forces Personnel who had retired till 30th June 2014 are covered under it.
• The implementation of the scheme was based on recommendation of the Koshiyari committee, a 10 member all-party parliamentary panel formed under the chairmanship of Bhagat Singh Koshiyari.

Hence option 4th is correct.