General Studies · Puzzle Test

Seven boxes, B, D, E, P, S, T and W, are kept one over the other, but not necessarily in the same order. No box is kept above P. Only three boxes are kept between P and B. Only one box is kept between D and S. S is kept immediately above B. Only four boxes are kept between D and T. E is kept at some place above W. Which box is kept second below E?