Answer: The correct answer is Option d.
Step-by-step explanation:
Covalent bonds are defined as the bonds which are formed when electrons are shared between two atoms.
Ionic bonds are defined as the bonds which are formed when there is complete transfer of electrons from one atom to another atom.
Metallic bonds are formed where the valence electrons of metal atoms are delocalized across the metallic lattice.
Ductility is the property shown by metals in which metals can be drawn into thin wires and metals also are the good conductors of electricity.
Metals only form metallic bonds. Hence, the correct answer is Option d.