Consider the following statements regarding the stealth frigate Tamal and India’s warship-building capability:
1. Tamal is the last warship that India will commission outside the country or import.
2. India signed an Inter-Governmental Agreement with Russia in 2016 for four follow-on stealth frigates, all of which are being built in Russia.
3. INS Tushil, another stealth frigate under the same deal, was commissioned in 2024 and has reached its home port in Karwar.
4. The Indian Navy has been designing and constructing warships domestically for several decades.
Which of the statements given above are correct?