While Ginger waited for iVillage.com's apparel site to download, a small ad encouraging her to check out the summer clothes at Nordstrom department store and at its Web site appeared on her computer screen. The Nordstrom's ad is an example of:
A. content sponsorship.
B. a pop-up.
C. push technology.
D. functional sponsorship.
E. a pop-under.
Answer: B