Answer:
a. rivals, buyers, suppliers, substitutes, and potential entrants
Step-by-step explanation:
Porter's Five Forces model can be regarded as the framework used in analysis of compititive environment of a company/firm. It helps to know the power of the compititive rival of the firm, the influence of products that are substitute of the product of company on the company as so on. It should be noted that According to the Five Forces Model;rivals, buyers, suppliers, substitutes, and potential entrants are the five competitive forces that determine the level of competition and profitability in an industry.