Explanation:

National Disaster Management Authority (NDMA) has developed ‘National Migrant Information System (NMIS)’, a central online repository on Migrant Workers to facilitate their seamless movement across States. The online portal would maintain a central repository on migrant workers and help in speedy inter-State communication/co-ordination to facilitate their smooth movement to native places. The key data pertaining to the persons migrating has been standardized for uploading such as name, age, mobile no., originating and destination district, date of travel etc., which States are already collecting. States will be able to visualize how many people are going out from where and how many are reaching destination States. Hence option 4th is correct.