Some letters are given which are numbered 1, 2, 3, 4, 5 and 6 followed by four options containing combinations of these numbers. Find the combination of numbers so that letters arranged accordingly form a meaningful word.(IMO 2014) A4, 3, 5, 6, 1, 2 B4, 3, 2, 1, 5, 6 C4, 2, 3, 1, 6, 5 D4, 2, 3, 6, 1, 5