Which of the following marketing channels involves using opinion leaders to promote products or services to their followers?

Which of the following consumer behavior models suggests that consumers go through a process of need recognition, information search, evaluation of alternatives, purchase, and post-purchase evaluation? Which of the following marketing strategies involves creating a series of small, incremental product improvements to maintain customer interest and loyalty? Which of the following marketing metrics measures the return on investment (ROI) of a marketing campaign by comparing the revenue generated to the cost of the campaign? Which of the following marketing channels involves using opinion leaders to promote products or services to their followers? Which of the following marketing strategies involves creating a unique and memorable brand identity to differentiate a product or service from competitors?