How Does Viral Marketing Differ from Word-Of-Mouth Communication

How does viral marketing differ from word-of-mouth communication?

A) In terms of the promotional mix, viral marketing is most closely related to publicity, while word-of-mouth is most like sales promotions.
B) Word-of-mouth communications is ethical and legal, but the Federal Trade Commission is studiouslyinvestigating the legal ramifications of viral marketing.
C) The channel for all word-of-mouth communication is personal contact, and the channel for all viral marketing is the Internet.
D) The advertiser intentionally stimulates viral marketing; the advertiser cannot control word-of-mouth communication.
E) Word-of-mouth communication has a sponsor, and viral marketing does not.