Joel Veitch Is the Creator of a British Internet Comedy

Joel Veitch is the creator of a British Internet comedy screen called Viking Kittens.Photographs of two kittens have been modified to make them look like Vikings and then superimposed on an animated background of them crossing the ocean on a Viking ship.In the background plays Led Zeppelin's "Immigrant Song." More striking perhaps than the comedy of the animation is the fact that as the kittens are rolling along the waves,you can follow a link to an on-line store selling mugs,t-shirts,and sweatshirts with the Viking kittens' image emblazoned on them.Veitch began adding merchandise only a week after the site went live as a response to e-mail requesting he create Viking Kitten products.He says he sells about 15 to 20 items a day from his various comic websites,and he estimates selling one item for roughly 3,500 Viking Kittens page views.
-Refer to Online Dictionary.Marlo is considering using the power of e-mail to encourage customers to tell their friends about her dictionary.What is this known as?

A) customer relationship creation
B) blanket marketing
C) spread
D) viral marketing