A paper company currently accepts online orders for three types of printer papers: LetterOrder, A4Order, and B4Order. Customers call a method PaperOrderIF orderPaper(String type) to order a desired type of paper product. The paper company has the plan to produce more paper types in the future so the design should be flexible enough for such a future change. What design pattern you would choose to create objects of more paper types without causing code changes in client?