In 2011 a computer called Watson competed against and beat former champions during rounds of Jeopardy. Watson uses artifical intelligence to understand and answer questions posed in everyday language. A similar technology enables computers to understand the relationships among topics, concepts and characteristics to help users search for information. This is the basis for what concept?

a.Tacit knowledge
b.Web 3.0
c.Mashups
d.Knowledge management systems
web 3.0