Which of the following cannot be obtained in anhydrous form by heating its hydrate?

Remember : (i) MgCl2.2H2O can be converted to anhydrous MgCl2 byheating it in the presence of HCI gas.MgCl2⋅2H2O→ΔHClgMgCl2+2H2Oii MgCl2⋅6H2O and MgCl2⋅8H2O have also been obtained in crystalline form.