9. What are the differences between search engine optimization (SEO) and pay-per-click (PPC)? (A) PPC is organic. It is a form of advertising that drives traffic. SEO guarantees that the ads appeared at the top of the page, above the listings influenced by PP( C ) (B) SEO refers to the search results of a search engine that can be influenced by paid advertising. PPC results are ranked according to the advertising fee. (C) PPC is a form of advertising that drives traffic. Paid ads appear at the top of the page, above the organic listings influenced by SEO. (D) Organic search refers to the search results of a search engine that cannot be influenced by paid advertising. SEO results are ranked according to the advertising fee.