Correct Answer: email
Source: Every referral to a web site has an origin or source. Possible sources include: “google” (the name of a search engine), “facebook.com” (the name of a referring site), “spring_newsletter” (the name of one of your newsletters), and “direct” (users that typed your URL directly into their browser, or who had bookmarked your site).
Read more here: https://support.google.com/analytics/answer/1033173
More Questions from the Google Analytics Individual Qualification (GAIQ) Exam
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