Under which document was the separate electorate granted for muslims ?

A momentous introduction in the reforms were the separate electorates where seats were reserved for Muslims and in which only Muslims would be polled. The implication that Muslims and their interests could only be protected by Muslims would influence Indian politics in the ensuing decades. The Muslim League had been founded in 1906 by an elite aiming to promote Muslim interests, prevent Hindu dominance over Muslims through a parliamentary system and to advance the Muslim perspective in the deliberations regarding constitutional reforms after October 1907.