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Consider the following statements regarding the Corps of Forty:
1. The system was established by Iltutmish, Also known as Bandgan-i-khas, Bandagan-i-chahalgani.
2. They were basically an elite cadre of Slaves and were military leaders themselves.
3. They were close and loyal to the sovereign and emerged as kingmakers.
4. Balban was not a member of the corps of Forty.
Which of the above statements are correct :