The "Natural Nourishment" granola bars manufactured by Global Good Foods have been the top-selling granola bars in the market. Though the market for granola bars is flooded with competitors, Global Good has been able to maintain its market position for a long time. This is mainly attributed to the pleasant texture of its granola, which comes from a proprietary processing technique used by the company. This competency of Global Good Foods will be considered as a(n) _____ resource in the VRIO framework.