Explanation:

All of the above codes are correct.

• The Indian Space Research Organisation (ISRO) is the pioneer space exploration agency of India, headquartered at Bengaluru.

Achievements of ISRO

• The first Indian satellite, Aryabhata, was built by the ISRO and launched with the help of the Soviet Union on 19th April 1975.
• The year 1980 marked the launch of Rohini, which was the first satellite to be successfully placed in orbit by SLV-3, an Indian made launch vehicle.
• Some remarkable space probes of ISRO include Chandrayaan-1 lunar orbiter, Mars Orbiter Mission (Mangalyaan-1) and ASTROSAT space observatory.
• India launched Chandrayaan-2, its second lunar exploration mission after Chandrayaan-1 on 22nd July 2019.

Major ISRO Achievements of 2021

• Amazonia-1: The 53rd flight of PSLV-C51 marked the first dedicated mission for New Space India Ltd (NSIL), the commercial arm of ISRO.
• UNITYsat (three satellites): They have been deployed to provide Radio relay services.

Hence option 4th is correct.