Mo-Fire Beverage Company (Pty) Ltd manufactures and sells a variety of energy drinks. All products are scientifically produced using high quality ingredients allowing them to have energising and stimulating effects. Caffeine, Guarana and B-Vitamins are the core ingredients of the energy drink. The cost of the research performed in developing the products (i.e. energy drinks) will be classified as... Period costs Sunk cost Opportunity cost None of the above