With reference to Indian history, consider the following statements: (2022)
1. The first Mongol invasion of India happened during the reign of Jalalud-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 the north-west of his kingdom to Mongols
Which of the statements given above is/are correct?