Explanation:

A large-scale tri-service joint amphibious exercise AMPHEX – 21 was conducted in Andaman & Nicobar group of islands from 21 – 25 Jan 2021.

• The exercise involved participation of Naval ships, amphibious troops of the Army and different types of aircraft from the Air force.
• The exercise was aimed at validating India’s capabilities to safeguard the territorial integrity of it’s island territories. It also sought to enhance operational synergy and joint warfighting capabilities amongst the three Services.
• The exercise involved multi-faceted maritime operations by synergised employment of amphibious assault ships, surveillance platforms, execution of maritime air strikes and complex manoeuvres at sea.
• Ex KAVACH for defence of Andaman & Nicobar Islands formed a part of AMPHEX – 21.
• A joint intelligence, surveillance and reconnaissance exercise under the aegis of HQ Integrated Defence Staff was also run concurrently to achieve Maritime Domain Awareness by employment of a multitude of sensors.

Hence option 2nd is correct.