In the following reaction sequence, correct structure(s) of Y is (are)

TsCl doesn’t affect the stereochemistry while other two reactions are SN2 and hence invert the configuration twice which leads to retention of configuration. As the product if optically inactive, both (1) & (3) are the same and should give the product. (To avoid any confusion think of cyclohexane chair form i.e axial and equatorial forms)