plz... give me the solution

Consider the following set theoretic expressions X, Y and Z where U-union, -intersection and superscript 'C' is set complement: X = Pn QnR Y = Pn Q)u (Pn R)u (Q R) Z = (QU P) n PU R) n PUQ nPo P U R) Then which of the following is true ? (A) No two expressions represent same set (B) All three expressions represent same set (C) Only X and Z represent same set D) Only Y and Z represent same set