The fourth Buddhist council was convened in Kahsmir by Kanishkaunder the chairmanship of Vasumitra. Hence option 4 is correct. First Buddhist Council held under the patronage of king Ajatshatru with the monk Mahakasyapa presiding. Second council was held under the patronage of King Kalasoka and the presidency of Sabakami. Third council was held under the patronage of King Asoka and under the presidency of Moggaliputta Tissa.