Research Conducted by Leskovec and Horvitz (2007) Has Found That

Research conducted by Leskovec and Horvitz (2007) has found that, in an analysis of instant messaging interactions between 240 million people, the connection between 90 percent of pairs

A) could be connected in about 20 links/hops.
B) could not reliably be connected using the six degrees of separation theory.
C) were connected within 8 links/hops.
D) were operating only in localized (physically close) network conversations.