In which plastic-type, crossed linkages are present?

a) Melamine type

b) Bakelite type

c) Poly vinyl type

d) Polyenthene type

Cross-link refers to a bond that links one polymer chain to another polymer chain. The cross-linked polymer leads to the formation of long chains which can be either branched or linear that can create covalent bonds between the polymeric molecules. Melamine and Bakelite are examples of cross-linked polymers.