Why do the bond energies decrease in the order Ge-Cl, Ge-Br, Ge-I?

Question

1. Covalent bond energies generally increase as you go down the periodic table
2. Covalent bond energies generally decrease as you go down the periodic table
3.Ionic bond energies generally decrease as you go down the periodic table
4. Ionic bond energies generally increase as you go down the periodic table
5. The polarizability of bonds generally decreases as you go down the periodic table
6. The polarizability of bonds generally increases as you go down the periodic table