Which of the Following Is a Disadvantage of Viral Marketing

Which of the following is a disadvantage of viral marketing?

A) Marketers have little control over who receives a viral message.
B) The costs of viral marketing are generally too high for most companies.
C) Viral messages are less likely to be viewed than other types of online promotions.
D) Viral messages are blocked by most search engines.
E) The brand associated with the viral message is usually forgotten.