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Final answer:Direct mail marketing is the correct answer as it is not a form of digital marketing; it involves sending physical materials, unlike social media, email, and SEO which are digital.Hence, the correct answer is option d.Explanation:The form of digital marketing that does not belong in the list provided is d. direct mail marketing. Digital marketing includes strategies that use the internet and electronic devices to promote products and services. While social media marketing, email marketing, and search engine optimization (SEO) are distinctly digital in nature, direct mail marketing involves sending physical promotional materials through postal or other delivery services, which is a traditional form of marketing. It's crucial to differentiate between the vast array of digital marketing techniques and those traditional strategies still in use today, like direct mail marketing, which exists outside the digital realm....