Which of the following statement is/are correct?

1. The Marathas became the strongest power in southern India in the mid 18th century.
2. Marathas played the role of king-makers at the Madras court.
3. Marathas acted as the defenders of the country against foreign invaders like Ahmad Shah Abdali.
4. Decline of the Mughal Empire was the rise of the Marathas under the Peshwa.

Select the correct code from below.