During a trial, an attorney is planning to call to the stand to testify six different witnesses-T, V, W, X, Y and Z. She will call each witness exactly one time, and the other in which she calls them is subject to the following conditions (i) The fourth witness must be T. (ii) W and Y must both be called before V. (iii) X must be called before W. Which of the following must be true about the order in which the attorney calls the witnesses? A B D She calls V before T She calls X before V She calls Y before W She calls Y before X