Which of the following statements correctly differentiates chain growth polymers from step growth polymers?

Step growth polymers form only cyclic structures whereas chain growth polymers form linear structures.

Chain growth polymers are always biodegradable, while step growth polymers are not.

Chain growth polymers require a catalyst, whereas step growth polymers do not.

Chain growth polymers involve the addition of monomers to the growing end of a polymer chain, while step growth polymers involve reactions between functional groups of monomers.