Which of the Following Best Describes Viral Marketing

Which of the following best describes viral marketing?

A) The strategy of paying suppliers and distributors to perform certain business processes or to provide needed materials and resources
B) An approach by which firms move away from department-oriented organization and toward process-oriented team structures that cut across old departmental boundaries
C) The strategy of owning the means by which an organization produces goods or services
D) Any activity that adds value to some input by transforming it into an output for an internal or external customer
E) The strategy of using the Internet and word-of-mouth marketing to spread product information