Explanation:

Indian Naval Ships Shivalik and Kadmatt arrived at Jakarta, Indonesia on 18 September 2021 to participate in the 3rd edition of Bilateral Exercise ‘Samudra Shakti’ with the Indonesian Navy scheduled off the approaches to Sunda Strait from 20 Sep to 22 September, 2021.

• The exercise aims to strengthen the bilateral relationship, enhance mutual understanding and interoperability in maritime operations between the two navies.
• The exercise will also provide an appropriate platform to share best practices and develop a common understanding of Maritime Security Operations.
• In pursuance of India’s Act East Policy, Exercise ‘Samudra Shakti’ was conceived in 2018 as a bilateral IN-IDN exercise.
• The exercise has matured in complexity over the last two editions and will involve conduct of complex maritime operations including Military Interdiction Operations (MIO), Cross Deck Landings, Air Defence serials, Practice Weapon Firings, Replenishment Approaches and Tactical Manoeuvres.

Hence option 4th is correct.