Answer:
Ionic bonds
Explanation:
Ionic bonds occur when 1 atom looses 1 or more electrons while its recipient recieves 1 or more of its electrons.
Polar and nonpolar covalent bonds are where  unequal sharing of electrons occur with polarity.
Thus, it wouldn't be polar covalent bonds, nonpolar covalent bonds, or both kinds of covalent bonds. It would be ionic bonds.