The correct answer is option 2, INS Ranjit. INS Ranjit was a frontline destroyer of the Indian Navy that was decommissioned in May 2019. Decommissioning refers to the process of taking a ship out of active service and removing it from the naval fleet.

Option 1, INS Rana, is not the correct answer. INS Rana is a guided-missile destroyer of the Indian Navy and as of now, it has not been decommissioned.

Option 3, INS Rajput, is also not the correct answer. INS Rajput is a Rajput-class destroyer of the Indian Navy and there is no information that suggests it has been decommissioned.

Option 4, INS Sindhurakshak, is not the correct answer. INS Sindhurakshak was a submarine of the Indian Navy that suffered an explosion and sank in August 2013, resulting in the loss of the vessel and the lives of its crew members.

Therefore, the correct answer is option 2, INS Ranjit, as it was decommissioned in May 2019.