Why is the Ge-F bond energy so much more than the Ge-Cl bond energy?

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. The Ge-F bond is more polarizable than the Ge-Cl bond
4. The Ge-F bond is more ionic than the Ge-Cl bond
5. The Ge-F bond is more covalent than the Ge-Cl bond
6.The Ge-F has a smaller dipole moment than the Ge-Cl bond

Answer 1

maybe 3