With reference to India's long-range air defence modernisation, consider the following statements:
1. 'Kusha' is a Long-Range Surface-to-Air Missile (LR-SAM) being indigenously developed by DRDO.
2. Kusha's maiden flight test was conducted from Abdul Kalam Island off the coast of Odisha.
3. India currently operates the Russian S-400 Triumf air defence system.
4. The Integrated Air Defence Weapon System (IADWS) programme has no relationship with the Kusha missile project.
How many of the above statements are correct?