Leveraging consumers to promote a product or service is known as viral marketing. Thus the correct option is E.
Services are referred to as a type of goods that is offered to someone in terms of facilities like the one received in a restaurant or shopping mall. It is a type of commodity or product that is intangible in nature, one can only feel it.
Viral marketing is a type of promotion where people are urged to distribute information online about a brand's products or services. It aims to motivate people to spread marketing messages to friends, and family, in order to dramatically increase the number of its consumers.
Therefore, option E is appropriate.
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The complete question is Probably
Leveraging consumers to promote a product or service is known as _____.
A. straddling
B. affiliating
C. long tailing
D. crowdsourcing
E. viral marketing