Explanation:

The awareness and knowledge (or cognitive) stages are when a consumer is informed about a product or service, and how they process the information they have been given. For advertisers, it is essential to key brand information in this stage in a useful and easily understood fashion that compels the prospective customer to learn more and make a connection with a product.
The liking and preference (or affective) stages are when customers form feelings about a brand, so it is not a time when an advertiser should focus on a product, its positive attributes or technical abilities. Instead, advertisers should attempt to appeal to a consumer's values, emotions, self-esteem, or lifestyle.