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 Viking Kittens.Joel Veitch wants to track visitors to the site.If he knows more about them,he can have the website load their favourite animation as soon as they arrive at VikingKittens.com.To do this,what would Joel need to use?

A) Secured Sockets Layer
B) page view data
C) click-through data
D) cookies