Which of the following statements correctly describes the nature of conflicts between the British and other European powers in India prior to 1757?

1. The British East India Company engaged in direct military conflicts with the French East India Company, particularly in the southern regions of India.
2. The British focused solely on trade and did not seek territorial expansion until the conclusion of the Battle of Plassey in 1757.
3. The Carnatic Wars (1746-1763) were pivotal in establishing British dominance in southern India, where alliances with local rulers played a crucial role.
4. The Portuguese influence in India diminished significantly due to the military superiority of the British and French forces.

Which of the statements are correct?