History · Maratha Empire

With reference to the foundation of the Maratha Empire by Shivaji Maharaj and its subsequent administrative structure, consider the following statements: I. Shivaji Maharaj established the Hindavi Swarajya and formally assumed the title of Chhatrapati at Raigad Fort in 1674. II. The Maratha administration employed a Ryotwari-based revenue system, which exacted levies such as Chauth (25% tax) and Sardeshmukhi (10% tax). III. As the empire evolved into a confederacy, the Gaekwads established their central stronghold at Gwalior and expanded Maratha influence into Gujarat. IV. The Treaty of Purandar in 1665, signed with Raja Jai Singh of Amber, resulted in Shivaji surrendering 23 forts to the Mughals. Which of the statements given above are correct?