Which of the following statements about 'Exercise Mitra Shakti-2023' are correct? 1. This was a joint military exercise between India and Bangladesh. 2. It commenced in Aundh (Pune). 3. Joint response during counter-terrorism operations was a goal of this operation. 4. Indian Air Force was a part of this exercise. Select the correct answer using the code given below:

1. Incorrect. Exercise Mitra Shakti is a joint military exercise between India and Sri Lanka, not Bangladesh.
2. Correct. The 2023 edition commenced at Aundh, Pune in Maharashtra.
3. Correct. One of its stated aims was to enhance joint response in counter-terrorism operations.
4. Correct. The Indian Air Force participated in the exercise along with military contingents.

Hence, the correct statements are 2, 3 and 4.