Question: What version of the smartphone modeled designed and marketed by Apple Inc. that was introduced at the WWDC 2008?
Sentence (from "IPhone 3G"): The iPhone 3G is a smartphone that was designed and marketed by Apple Inc. It is the second generation of iPhone, successor to the original iPhone, and was introduced on June 9, 2008, at the WWDC 2008 at the Moscone Center in San Francisco, United States.
Relevant evidence: Yes