Delhi Sultanate and Early Islamic Rule

With reference to Indian history, consider the following statements: 1. The first Mongol invasion of India happened during the reign of Jalal-ud-din Khalji. 2. During the reign of Ala-ud-din Khalji, one Mongol assault marched up to Delhi and besieged the city. 3. Muhammad-bin-Tughlaq temporarily lost portions of north-west of his kingdom to Mongols. Which of the statements given above is/are correct?

Consider the following statements: 1. It was during the reign of Iltutmish that Chengiz Khan reached the Indus in pursuit of the fugitive Khwarezm prince. 2. It was during the reign of Muhammad bin Tughluq that Taimur occupied Multan and crossed the Indus. 3. It was during the reign of Deva Raya II of Vijayanagara Empire that Vasco da Gama reached the coast of Kerala. Which of the statements given above is/are correct?

Consider the following statements: 1. In the revenue administration of Delhi Sultanate, the in-charge of revenue collection was known as 'Amil'. 2. The Iqta system of Sultans of Delhi was an ancient indigenous institution. 3. The office of 'Mir Bakshi' came into existence during the reign of Khalji Sultans of Delhi. Which of the statements given above is/are correct?