IMBEX is a joint exercise conducted regularly between Armies of India and Myanmar. The correct answer is option 4.

The exercise is aimed at enhancing military cooperation and interoperability between the two countries. It includes various activities such as joint training, exchange of best practices, and sharing of experiences in counter-terrorism operations, disaster management, and humanitarian aid.

Option 1, Malaysia, is not the correct answer as there is no joint exercise called IMBEX between India and Malaysia.

Option 2, Maldives, is also not the correct answer as there is no joint exercise called IMBEX between India and Maldives.

Option 3, Mauritius, is also not the correct answer as there is no joint exercise called IMBEX between India and Mauritius.

It is important to note that the provided answer of option 4 is correct. If you believe that the correct answer should be different, please provide your answer with a proper explanation.