Which of the following is classified as a secondary bond in materials?

Primary or chemical bonding: It is found in solids-ionic, covalent, and metallic. This type of bonding arises from the tendency of the atoms to assume stable electron structures, like those of the INERT gases by completely filling the outermost electron SHELL. Covalent bonding: A covalent bond is a bond formed by equal sharing of both participating atoms. A covalent bond is also termed as a molecular bond.Ionic bonding: It is found between COMPOUNDS composed of both metallic and nonmetallic elements. Atoms of metallic elements easily give up their valance electrons to the nonmetallic atoms. Metallic bonding: It is found in metals and their ALLOYS. Secondary bonding: This bonding is also found in MANY solid materials, these are weaker than primary bonding but nonetheless influence the physical properties of some materials.Hydrogen bonding: It is a secondary bonding that exists between the molecules that have hydrogen as one of the constituents.