During the electrolysis of carnallite, MgCl2 is decomposed and not KCl. This is because of :
(1) lower decomposition voltage of MgCl2 than that of KCl
(2) reverse reaction MgCl2+2K⟶Mg+2KCl if KCl is decomposed under other experimental condition
(3) both (a) and (b)
(4) none of the above