Explanation:

Multinational Military Exercise SHANTIR OGROSHENA 2021 (Front Runner of the Peace) will be held at Bangladesh to commemorate the birth centenary of Bangladesh ‘Father of the Nation’ Bangabandhu Sheikh Mujibur Rahman and mark 50 years of liberation.

• Indian Army contingent comprising of 30 personnel including Officers, JCOs and Jawans of a Battalion from The DOGRA Regiment will participate in the exercise along with contingent of Royal Bhutan Army, Sri Lankan Army and Bangladesh Army from 04 Apr to 12 Apr 2021.
• The theme of the exercise is “Robust Peace Keeping Operations”.
• Military observers from USA, UK, Turkey, Kingdom of Saudi Arabia, Kuwait and Singapore will also be in attendance throughout the exercise.

Hence only statement 4th is correct.